Chevrolet Air Conditioner Chevrolet Camaro User Manual

A/C-HEATER SYSTEM - MANUAL  
2001 Chevrolet Camaro  
2000-01 MANUAL A/C-HEATER SYSTEMS  
General Motors  
Chevrolet; Camaro  
Pontiac; Firebird  
* PLEASE READ THIS FIRST *  
WARNING: To avoid injury from accidental air bag deployment, read and  
carefully follow all SERVICE PRECAUTIONS and DISABLING &  
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT  
SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section.  
SPECIFICATIONS  
SPECIFICATIONS  
Application  
Specification  
Compressor Type ................................. Harrison V7 7-Cyl.  
System Oil Capacity (1) ..................................... 9 ozs.  
Refrigerant (R-134a) Capacity ............................ 24.0 ozs.  
System Operating Pressures (2)  
2000 Models  
High Side ........................ 115-200 psi (8.1-14.1 kg/cm )  
Low Side ............................ 25-37 psi (1.8-2.6 kg/cm )  
2001 Models  
High Side ....................... 202-244 psi (14.2-17.2 kg/cm )  
Low Side ............................ 40-44 psi (2.8-3.1 kg/cm )  
(1) - Use PAG Refrigerant Oil (Part No. 12345923).  
(2) - Measured at ambient temperature of 70-80 F (21-27 C),  
with more than 50 percent relative humidity.  
DESCRIPTION  
The manual A/C-heater system delivers heated or cooled and  
dehumidified air. Air distribution is controlled through a manual A/C-  
heater control panel and vacuum-operated doors.  
OPERATION  
A/C-HEATER CONTROL PANEL  
Several mode settings are available on the A/C-heater control  
panel to allow selection of a desirable comfort level. See Fig. 1. The  
available settings are as follows:  
OFF  
No blower and A/C operation in this position. With vehicle  
moving forward, a slight amount of air will enter passenger  
compartment.  
MAX  
Maximum cooling is provided in this setting. Conditioned air  
is distributed through dash registers. This is the only mode in which  
1) Remove right instrument panel sound insulator. Remove  
temperature control cable from heater housing. Move temperature  
control knob from full cold to full hot setting. If cable binds or  
pulley does not rotate freely, replace cable. Set temperature control  
knob to detent position halfway between full cold and full hot  
setting.  
2) If control cable pulley is offset by 5-10 degrees toward  
full cold side, no adjustment is necessary. See Fig. 2. If control  
cable pulley is offset toward full hot side, remove spring from  
control cable pulley. Rotate pulley 5-10 degrees toward full cold.  
Install control cable pulley spring. Install temperature control cable  
to heater housing.  
Fig. 2: Adjusting Temperature Control Cable  
Courtesy of General Motors Corp.  
TROUBLE SHOOTING  
NOTE:  
For additional trouble shooting information, see MANUAL  
A/C-HEATER SYSTEMS - TROUBLE SHOOTING article.  
BLOWER MOTOR  
1) If blower does not operate, check HVAC fuse (20-amp) in  
instrument panel fuse block. If fuse is blown, check for short to  
ground in Brown wire between HVAC fuse (20-amp) and mode selector  
switch 3-pin connector terminal "C". If fuse is okay, check I/P-1 fuse  
(40-amp) in underhood electrical center. If fuse is blown, check for  
short to ground in Red wire between I/P-1 fuse (40-amp) and blower  
motor relay harness connector terminal A2.  
2) Ensure ground connectors located near left or right "A"  
pillar, bolted to instrument panel mounting stud behind kick panel are  
clean and tight. Check for a broken or partially broken wire inside of  
insulation which could cause system malfunction but prove good in a  
continuity/voltage check with system disconnected. Check for proper  
installation of aftermarket electronic equipment.  
SYSTEM TESTS  
WARNING: To avoid injury from accidental air bag deployment, read and  
carefully follow all SERVICE PRECAUTIONS and DISABLING &  
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY  
article in GENERAL SERVICING.  
A/C SYSTEM PERFORMANCE  
1) Rotate temperature control knob from full cold to full hot  
and back to full cold. Listen for temperature valve to seat in both  
full hot and full cold position. If temperature valve seats in both  
positions, go to next step. If temperature valve does not seat in both  
positions, go to step 4).  
2) Park vehicle out of direct sunlight. Close doors and  
windows. Open driver’s window 5-6" (127-152 mm). Open engine hood.  
Place vehicle in Park (A/T) or Neutral (M/T), and set parking brake.  
Set temperature control to maximum cold, maximum A/C, and blower to  
high speed. Start engine and go to next step.  
3) Observe A/C compressor. If compressor engages, go to next  
step. If compressor does not engage, see A/C COMPRESSOR CLUTCH  
CONTROLS - ALL MODELS article.  
4) Check cooling fan operation. If both cooling fans are  
operating, go to next step. If both cooling fans are not operating,  
see ELECTRIC COOLING FANS - ALL MODELS article.  
5) Connect A/C manifold gauge set. Place thermometer at  
instrument panel center vent. Set temperature control to maximum cold,  
maximum A/C, and blower to high speed. Run engine at idle for 2  
minutes. Note high-side and low-side pressures on A/C manifold gauge  
set. Determine relative humidity and ambient air temperature.  
Ensure system is operating within specified range. See  
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (2000 MODELS) and  
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (2000 MODELS)  
tables. Also see  
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (2001 MODELS) and  
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (2001 MODELS).  
6) If system is operating within specified range, system is  
okay. If system is not operating within specified range, check  
Variable Displacement Orifice Tube (VDOT) system. See MANUAL A/C-  
HEATER SYSTEMS - TROUBLE SHOOTING article.  
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (2000 MODELS)  
Ambient Temp.  
F ( C)  
High Pressure  
psi (kg/cm )  
Low Pressure  
psi (kg/cm )  
70-80 (21-29) (1) ...... 115-190 (8.1-13.4) ........ 24-34 (1.7-2.4)  
70-80 (21-29) (2) ...... 115-200 (8.1-14.1) ........ 25-37 (1.8-2.6)  
80-90 (27-33) (1) ...... 140-215 (9.8-15.1) ........ 28-38 (2.0-2.7)  
80-90 (27-33) (2) ..... 150-235 (10.5-16.5) ....... 30-40 (2.1-2.8)  
90-100 (33-38) (3) .... 165-260 (11.6-18.2) ....... 34-43 (2.4-3.0)  
90-100 (33-38) (4) .... 185-270 (13.0-19.0) ....... 36-48 (2.5-3.4)  
100-110 (38-44) (5) ... 210-290 (14.8-20.4) ....... 40-49 (2.8-3.4)  
100-110 (38-44) (6) ... 220-310 (15.5-21.8) ....... 43-52 (3.0-3.7)  
(1) - With relative humidity at less than 50 percent.  
(2) - With relative humidity at more than 50 percent.  
(3) - With relative humidity at less than 40 percent.  
(4) - With relative humidity at more than 40 percent.  
(5) - With relative humidity at less than 20 percent.  
(6) - With relative humidity at more than 20 percent.  
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (2000 MODELS)  
Ambient Temp. F ( C)  
Center Vent Temp. F ( C)  
70-80 (21-27) (1) ...................................... 38-48 (3-9)  
70-80 (21-27) (2) ..................................... 40-55 (4-13)  
80-90 (27-33) (1) ..................................... 38-55 (3-13)  
80-90 (27-33) (2) ..................................... 45-65 (7-18)  
90-100 (33-38) (3) .................................... 45-63 (7-17)  
90-100 (33-38) (4) ................................... 55-68 (13-20)  
100-110 (38-44) (5) .................................. 53-64 (12-18)  
100-110 (38-44) (6) .................................. 58-70 (14-21)  
(1) - With relative humidity at less than 50 percent.  
(2) - With relative humidity at more than 50 percent.  
(3) - With relative humidity at less than 40 percent.  
(4) - With relative humidity at more than 40 percent.  
(5) - With relative humidity at less than 20 percent.  
(6) - With relative humidity at more than 20 percent.  
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (2001 MODELS)  
Ambient Temp.  
F ( C)  
High Pressure  
psi (kg/cm)  
Low Pressure  
psi (kg/cm)  
50-55 (13-18) (1) ..... 157-187 (11.0-13.1) ....... 32-37 (2.2-2.6)  
66-75 (19-24) (2) ..... 177-218 (12.4-15.3) ....... 36-41 (2.5-2.9)  
76-85 (25-29) (3) ..... 202-244 (14.2-17.2) ....... 40-44 (2.8-3.1)  
86-95 (30-35) (4) ..... 218-261 (15.3-18.4) ....... 42-46 (3.0-3.2)  
96-105 (36-41) (6) .... 245-293 (17.2-20.6) ....... 46-51 (3.2-3.6)  
106-115 (42-46) (5) ... 255-300 (17.9-21.0) ....... 48-53 (3.4-3.7)  
116-120 (47-49) (7) ... 273-303 (19.2-21.3) ....... 49-54 (3.4-3.8)  
(1) - With relative humidity at 0-50 percent.  
(2) - With relative humidity at more than 40 percent.  
(3) - With relative humidity at more than 60 percent.  
(4) - With relative humidity at more than 30 percent.  
(5) - With relative humidity at more than 40 percent.  
(6) - With relative humidity at more than 20 percent.  
(7) - With relative humidity at less than 30 percent.  
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (2001 MODELS)  
Ambient Temp. F ( C)  
Center Vent Temp. F ( C)  
70-80 (21-27) (1) ...................................... 38-48 (3-9)  
70-80 (21-27) (2) ..................................... 40-55 (4-13)  
80-90 (27-33) (1) ..................................... 38-55 (3-13)  
80-90 (27-33) (2) ..................................... 45-65 (7-18)  
90-100 (33-38) (3) .................................... 45-63 (7-17)  
90-100 (33-38) (4) ................................... 55-68 (13-20)  
100-110 (38-44) (5) .................................. 53-64 (12-18)  
100-110 (38-44) (6) .................................. 58-70 (14-21)  
(1) - With relative humidity at less than 50 percent.  
(2) - With relative humidity at more than 50 percent.  
(3) - With relative humidity at less than 40 percent.  
(4) - With relative humidity at more than 40 percent.  
(5) - With relative humidity at less than 20 percent.  
(6) - With relative humidity at more than 20 percent.  
DIAGNOSTIC SYSTEM TEST  
1) Connect scan tool to Data Link Connector (DLC). DLC is  
located under instrument panel, near steering column. If scan tool  
powers up, go to next step. If scan tool does not power up, go to  
appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.  
2) Turn ignition switch to ON position. Attempt to establish  
communications with A/C-heater control module, Body Control Module  
(BCM) and Powertrain Control Module (PCM). If communications is  
establish to all desired modules, go to next step. If communications  
is not established to all desired modules, go to appropriate BODY  
CONTROL MODULES article in ACCESSORIES & EQUIPMENT.  
3) Following scan tool manufacturer’s instructions, select  
DISPLAY DTCs function for A/C-heater control module, BCM and PCM. If  
any Diagnostic Trouble Codes (DTCs) are displayed, go to next step. If  
no DTCs are displayed, perform procedure for appropriate symptom.  
4) If scan tool displays any DTCs beginning with "U", go to  
appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.  
If no DTCs beginning with "U" are displayed, go to next step.  
5) If scan tool displays any DTCs beginning with "B", go to  
appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.  
If no DTCs beginning with "B" are displayed, go to next step.  
6) If scan tool displays any DTCs beginning with "P", go to  
appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs  
beginning with "P" are displayed, perform procedure for appropriate  
symptom.  
BLOWER MOTOR ALWAYS ON  
2000 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to OFF position. Disconnect blower  
motor relay. Using test light connected to ground, probe blower motor  
relay harness connector terminal A1 (Orange wire). If test light  
illuminates, go to next step. If test light does not illuminate, go to  
step 4).  
3) Repair short to battery voltage in Orange wire between  
blower motor relay harness connector terminal A1 and blower motor  
switch harness connector C1 terminal "B" located at A/C-heater control  
panel. After repair, go to step 9).  
4) Using test light connected to ground, probe blower motor  
relay harness connector terminal B2 (Dark Blue wire). If test light  
illuminates, go to next step. If test light does not illuminate, go to  
step 6).  
5) Repair short to battery voltage in Dark Blue wire between  
blower motor relay harness connector terminal B2 and blower motor  
resistor harness connector terminal "C". After repair, go to step 9).  
6) Using test light connected to ground, probe blower motor  
relay harness connector terminal C1 (Purple wire). If test light  
illuminates, go to next step. If test light does not illuminate, go to  
step 8).  
7) Repair short to battery voltage in Purple wire between  
blower motor relay harness connector terminal C1 and blower motor  
harness connector terminal "B". After repair, go to step 9).  
8) Replace blower motor relay. After repair, go to next step.  
9) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 2).  
2001 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to ON position. Set mode switch in  
OFF position. If blower motor is off, problem is intermittent. Check  
for faulty wiring or poor connections. Repair or replace as necessary.  
After repair, go to step 14). If no problem is found, go to next step.  
3) Turn ignition switch to OFF position. Disconnect blower  
motor relay. Turn ignition switch to ON position. If blower motor does  
not operate, go to next step. If blower motor operates, go to 11).  
4) Ensure mode switch is in OFF position. Set blower speed  
switch at lowest speed position. Using test light connected to ground,  
probe blower motor relay harness connector terminal B2. If test light  
illuminates, go to next step. If test light does not illuminate, go to  
step 6).  
5) Check Orange wire between blower motor switch harness  
connector C1 terminal "B" and blower motor relay harness connector  
terminal B2 for short to voltage. Repair Orange wire as necessary.  
After repair, go to step 14). If wire is okay, go to step 10).  
6) Using test light connected to ground, probe blower motor  
relay harness connector terminal B2 (Dark Blue wire). If test light  
illuminates, go to next step. If test light does not illuminate, go to  
step 9).  
7) Check Dark Blue wire between blower motor relay harness  
connector terminal B2 and blower motor resistor harness connector  
terminal "C" for short to voltage. Repair Dark Blue wire as necessary.  
After repair, go to step 14). If wire is okay, go to next step.  
8) Check Yellow, Tan and Light Blue wires for short to  
voltage between blower motor switch harness connector C1 at A/C-heater  
control panel and blower motor resistor harness connector. Repair  
suspect wire as necessary. After repair, go to step 14). If wires are  
okay, go to step 10).  
9) Check for poor connections or connector damage at blower  
motor relay harness connectors. Repair or replace as necessary. After  
repair, go to step 14). If connections are okay, go to step 12).  
10) Check for poor connections or connector damage at A/C-  
heater control panel harness connectors. Repair or replace as  
necessary. After repair, go to step 14). If connections are okay, go  
to step 13).  
11) Repair short to voltage in Purple wire between blower  
motor harness connector terminal "B" and blower motor relay harness  
connector terminal C1. After repair, go to step 14).  
12) Replace blower motor relay. After repair, go to step 14).  
13) Replace A/C-heater control panel. See  
A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. After repair,  
go to next step.  
14) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 2).  
BLOWER MOTOR INOPERATIVE IN HIGH SPEED  
2000 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Set mode switch in VENT position. Set blower motor switch  
in highest speed position. Using test light connected to ground,  
backprobe A/C-heater control panel harness connector C1 terminal "B"  
(Orange wire). If test light illuminates, go to next step. If test  
light does not illuminate, go to step 4).  
3) Using test light connected to ground, probe blower motor  
relay harness connector terminal A1 (Orange wire). If test light  
illuminates, go to step 6). If test light does not illuminate, go to  
step 7).  
4) Check for poor connection or connector damage at A/C-  
heater control panel harness connector C1. See WIRING DIAGRAMS. Repair  
or replace as necessary. After repair, go to step 13). If connections  
are okay, go to next step.  
5) Replace blower motor switch. See BLOWER MOTOR SWITCH under  
REMOVAL & INSTALLATION. After repair, go to step 13).  
6) Connect test light between blower motor relay harness  
connector terminals A1 (Orange wire) and C2 (Black wire). If test  
light illuminates, go to step 8). If test light does not illuminate,  
go to step 9).  
7) Repair open or poor connection in Orange wire between  
blower motor relay harness connector terminal A1 and blower motor  
resistor harness connector terminal "C". After repair, go to step 13).  
8) Connect test light between blower motor relay harness  
connector terminals A2 (Red wire) and C2 (Black wire). If test light  
illuminates, go to step 10). If test light does not illuminate, go to  
step 12).  
9) Repair open or poor connection in Black wire between  
blower motor relay harness connector terminal C2 and ground. After  
repair, go to step 13).  
10) Check for poor connections or connector damage at blower  
motor relay harness connector. Repair or replace as necessary. After  
repair, go to step 13). If connections are okay, go to next step.  
11) Replace blower motor relay. After repair, go to step 13).  
12) Repair open or poor connection in Red wire between blower  
motor relay harness connector terminal A2 and I/P MAXI-FUSE No. 1  
located in underhood electrical center. After repair, go to next step.  
13) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative in high speed, return to step 3).  
BLOWER MOTOR INOPERATIVE  
2000 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to ON position. Set mode selector  
switch to VENT position. Using test light connected to ground, probe  
A/C-heater control panel harness connector C1 terminal "E" (Light  
Green wire). If test light illuminates, go to next step. If test light  
does not illuminate, go to step 15).  
3) Set blower motor switch in low speed position. Using test  
light connected to ground, probe A/C-heater control panel harness  
connector C1 terminal "A" (Yellow wire). If test light illuminates, go  
to next step. If test light does not illuminate, go to step 5).  
4) Turn ignition switch to OFF position. Disconnect blower  
motor relay. Connect fused jumper wire between blower motor relay  
harness connector terminal B2 (Dark Blue wire) and C1 (Purple wire).  
Turn ignition switch to ON position. Set mode selector switch to VENT  
position. Place blower motor switch in low speed position. If blower  
motor operates, go to step 8). If blower motor does not operate, go to  
step 7).  
5) Check for poor connection or connector damage at blower  
switch harness connector. Repair or replace as necessary. After  
repair, go to step 20). If connection is okay, go to next step.  
6) Replace blower motor switch. See BLOWER MOTOR SWITCH under  
REMOVAL & INSTALLATION. After repair, go to step 20).  
7) Leave jumper wire connected as described in step 4). Turn  
ignition switch to OFF position. Disconnect blower motor harness  
connector. Turn ignition switch to ON position. Connect test light  
between blower motor harness connector terminals "A" (Black wire) and  
"B" (Purple wire). If test light illuminates, go to step 11). If test  
light does not illuminate, go to step 10).  
8) Check for poor connection at blower motor relay harness  
connector. Repair or replace as necessary. After repair, go to step  
20). If connection is okay, go to next step.  
9) Replace blower motor relay. After repair, go to step 20).  
10) Leave jumper wire connected. Using test light connected  
to ground, probe blower motor harness connector terminal "B" (Purple  
wire). If test light illuminates, go to step 14). If test light does  
not illuminate, go to step 13).  
11) Check for poor connection or connector damage at blower  
motor harness connector. Repair or replace as necessary. After repair,  
go to step 20). If connection is okay, go to next step.  
12) Replace blower motor. See BLOWER MOTOR under REMOVAL &  
INSTALLATION. After repair, go to step 20).  
13) Repair open or poor connection in Purple wire between  
blower motor relay harness connector terminal C1 and blower motor  
harness connector terminal "B". After repair, go to step 20).  
14) Repair open or poor connection in Black wire between  
ground and blower motor harness connector terminal "A". After repair,  
go to step 20).  
15) Using test light connected to ground, probe A/C-heater  
control panel harness connector C2 terminal "C" (Brown wire). If test  
light illuminates, go to next step. If test light does not illuminate,  
go to step 19).  
16) Check for open circuit or poor connection between A/C-  
heater control panel harness connector C2 terminals "B" (Light Green  
wire) and "C" (Brown wire). See WIRING DIAGRAMS. Repair or replace as  
necessary. After repair, go to step 20). If no problem is found, go to  
next step.  
17) Check for poor connection(s) or connector damage at A/C-  
heater control panel switch harness connectors. Repair or replace as  
necessary. After repair, go to step 20). If connections are okay, go  
to next step.  
18) Replace A/C-heater control panel. See  
A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. After repair,  
go to step 20).  
19) Check for poor connection or wire damage in Brown wire  
between A/C-heater control panel harness connector C2 terminal "C" and  
HVAC fuse (20-amp) located in instrument panel fuse block. Repair or  
replace as necessary. After repair, go to next step.  
20) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 3).  
2001 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to ON position. Set mode selector  
switch to VENT position. Place blower motor switch in each speed  
position. If blower operates in any position, problem is intermittent.  
Check for poor connections. loose components or damaged wiring. Repair  
or replace as necessary. After repair, go to step 16). If blower motor  
does not operate in any speed position, go to next step.  
3) Turn ignition switch to OFF position. Disconnect blower  
motor harness connector. Turn ignition switch to ON position. Place  
blower motor switch in lowest speed position. Using test light  
connected to ground, probe blower motor harness connector terminal "B"  
(Purple wire). If test light illuminates, go to next step. If test  
light does not illuminate, go to step 5).  
4) Check Black wire between blower motor harness connector  
terminal "A" and ground for open or high resistance. See  
WIRING DIAGRAMS. Repair Black wire as necessary. After repair, go to  
step 16). If wire is okay, go to step 10).  
5) Turn ignition switch to OFF position. Disconnect blower  
motor resistor harness connector. Turn ignition switch to ON position.  
Set blower motor switch to lowest speed position. Using test light  
connected to ground, probe blower motor resistor harness connector  
terminal "B" (Yellow wire). If test light does not illuminate, go to  
next step. If test light illuminates, go to step 8).  
6) Check Yellow wire between blower motor resistor harness  
connector terminal "B" and A/C-heater control panel harness connector  
C1 terminal "A" for open or high resistance. Repair Yellow wire as  
necessary. After repair, go to step 16). If wire is okay, go to next  
step.  
7) Turn ignition switch to OFF position. Disconnect A/C-  
heater control panel harness connector C2. See WIRING DIAGRAMS. Turn  
ignition switch to ON position. Using test light connected to ground,  
probe A/C-heater control panel harness connector C2 terminal "C"  
(Brown wire). If test light illuminates, go to step 11). If test light  
does not illuminate, go to step 12).  
8) Check Purple wire between blower motor relay harness  
connector terminal C1 and blower motor harness connector terminal "B"  
for open or high resistance. Repair Purple wire as necessary. After  
repair, go to step 16). If wire is okay, go to next step.  
9) Check for poor connections or connector damage at blower  
motor relay harness connector. Repair of replace as necessary. After  
repair, go to step 16). If connections are okay, go to step 13).  
10) Check for poor connections or connector damage at blower  
motor harness connector. Repair of replace as necessary. After repair,  
go to step 16). If connections are okay, go to step 14).  
11) Check for poor connections or connector damage at A/C-  
heater control panel harness connector. Repair of replace as  
necessary. After repair, go to step 16). If connections are okay, go  
to step 15).  
12) Repair Brown wire between HVAC fuse (20-amp) located in  
instrument panel fuse block and A/C-heater control panel harness  
connector C2 terminal "C" as necessary. After repair, go to step 16).  
13) Replace blower motor relay. After repair, go to step 16).  
14) Replace blower motor. See BLOWER MOTOR under REMOVAL &  
INSTALLATION. After repair, go to step 16).  
15) Replace A/C-heater control panel. See  
A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. After repair,  
go to next step.  
16) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 3).  
BLOWER MOTOR OPERATES IN HIGH SPEED ONLY  
2000 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to ON position. Set mode selector  
switch in VENT position. Set blower motor switch in lowest speed  
position. Using test light connected to ground, probe blower motor  
resistor harness connector terminal "C" (Dark Blue wire). If test  
light illuminates, go to next step. If test light does not illuminate,  
go to step 4).  
3) Using test light connected to ground, probe blower motor  
relay harness connector terminal B2 (Dark Blue wire). If test light  
illuminates, go to step 6). If test light does not illuminate, go to  
step 8).  
4) Check for poor connection or connector damage at blower  
motor resistor harness connector. Repair or replace as necessary.  
After repair, go to step 9). If connection is okay, go to next step.  
5) Replace blower motor resistor. See BLOWER MOTOR RESISTOR  
under REMOVAL & INSTALLATION. After repair, go to step 9).  
6) Check for poor connection or connector damage at blower  
motor relay harness connector. Repair or replace as necessary. After  
repair, go to step 9). If connection is okay, go to next step.  
7) Replace blower motor relay. After repair, go to step 9).  
8) Repair open or poor connection in Dark Blue wire between  
blower relay harness connector terminal B2 and blower motor resistor  
harness connector terminal "C". After repair, go to next step.  
9) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 3).  
BLOWER SPEED INOPERATIVE IN LOW, MEDIUM-LOW OR MEDIUM-HIGH  
SPEED  
2000 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to OFF position. Disconnect blower  
motor resistor harness connector. Turn ignition switch to ON position.  
Set blower motor switch in OFF position. Using test light connected to  
ground, probe A/C-heater control panel harness connector C1 terminal  
for circuit corresponding to inoperative blower speed. See  
WIRING DIAGRAMS. If test light illuminates on suspect circuit. go to  
next step. If test light does not illuminate, go to step 5).  
3) Check for poor connection or connector damage at blower  
motor resistor harness connector. Repair or replace as necessary.  
After repair, go to step 9). If connections are okay, go to next step.  
4) Replace blower motor resistor. See BLOWER MOTOR RESISTOR  
under REMOVAL & INSTALLATION. After repair, go to step 9).  
5) Using test light connected to ground, individually probe  
A/C-heater control panel harness connector C1 terminal which did not  
cause test light to illuminate in step 2). If test light illuminates,  
go to next step. If test light does not illuminate, go to step 7).  
6) Repair open or poor connection in Yellow, Tan or Light  
Blue wire(s) between A/C-heater control panel harness connector C1 and  
blower motor resistor harness connector. See WIRING DIAGRAMS. After  
repair, go to step 9).  
7) Check for poor connections or connector damage at A/C-  
heater control panel harness connector C1. Repair or replace as  
necessary. After repair, go to step 9). If connections are okay, go to  
next step.  
8) Replace blower motor switch. See BLOWER MOTOR SWITCH under  
REMOVAL & INSTALLATION. After repair, go to next step.  
9) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 3).  
BLOWER MOTOR MALFUNCTIONS  
2001 Models  
1) Perform DIAGNOSTIC SYSTEM TEST. Go to next step.  
2) Turn ignition switch to ON position. Set mode switch to  
VENT position. Turn blower switch to each speed position. If blower  
motor operates normally, go to next step. If blower motor  
malfunctions, go to step 4).  
3) Place blower motor switch at maximum speed position. Place  
mode switch in each position. If blower operates in each switch  
position, problem is intermittent. Check for faulty wiring, poor  
connections or damaged components. Repair as necessary. After repair,  
go to step 24). If no problem is found, go to step 18).  
4) Turn ignition switch to OFF position. Disconnect blower  
motor harness connector. Turn ignition switch to ON position. Using  
test light connected to ground, probe blower motor harness connector  
terminal "B" (Purple wire). Place blower motor switch in each speed  
position. If test light does not illuminate in each speed position, go  
to next step. If test light illuminates in all speed positions, go to  
step 16).  
5) If test light does not illuminate in maximum speed  
position, go to next step. If test light illuminates in maximum speed  
position, go to step 10).  
6) Turn ignition switch to OFF position. Disconnect blower  
motor relay. Turn ignition switch to ON position. Using test light  
connected to ground, probe blower motor relay harness connector  
terminal A2 (Red wire). If test light illuminates, go to next step. If  
test light does not illuminate, go to step 19).  
7) Set blower motor switch in maximum speed position. Using  
test light connected to ground, probe blower motor relay harness  
connector terminal A1 (Orange wire). If test light does not  
illuminate, go to next step. If test light illuminates, go to step 9).  
8) Check Orange wire between blower motor relay harness  
connector terminal A1 and blower motor switch harness connector C1  
terminal "B" located at A/C-heater control panel for open or high  
resistance. Repair Orange wire as necessary. After repair, go to step  
24). If wire is okay, go to step 14).  
9) Check Black wire for open or high resistance between  
blower motor relay harness connector terminal C2 and ground. Repair  
Black wire as necessary. After repair, go to step 24). If wire is  
okay, go to step 15).  
10) Turn ignition switch to OFF position. Disconnect blower  
motor relay. Turn ignition switch to ON position. Using test light  
connected to ground, probe blower motor relay harness connector  
terminal B2 (Dark Blue wire). Alternately set blower motor switch in  
minimum, M1 (medium-low) and M2 (medium-high) speed positions. If test  
light illuminates in each speed position, go to step 15). If test  
light does not illuminate, go to next step.  
11) Check Dark Blue wire between blower motor relay harness  
connector terminal B2 and blower motor resistor harness connector  
terminal "C" for short to ground, open or high resistance. Repair Dark  
Blue wire as necessary. After repair, go to step 24). If wire is okay,  
go to next step.  
12) Turn ignition switch to OFF position. Disconnect blower  
motor resistor harness connector. Turn ignition switch to ON position.  
Set mode switch in VENT position. Using test light connected to  
ground, individually probe blower motor resistor harness connector  
terminals "A" (Tan wire), "B" (Yellow wire) and "D" (Light Blue wire).  
See WIRING DIAGRAMS. Set blower motor switch in speed position  
corresponding to wire being tested. If test light does not illuminate  
at any switch position, go to next step. If test light illuminates at  
each switch position, go to step 17).  
13) Check suspect blower motor control circuit identified in  
previous step for open or high resistance. Repair suspect wire as  
necessary. After repair, go to step 24). If wire is okay, go to step  
18).  
14) Check Light Green wire between A/C-heater control panel  
harness connector C2 terminal "B" and blower motor switch harness  
connector C1 terminal "E" located at A/C-heater control panel for open  
or high resistance. Repair Light Green wire as necessary. After  
repair, go to step 24). If wire is okay, go to step 18).  
15) Check for poor connections or connector damage at blower  
motor relay harness connector. Repair or replace as necessary. After  
repair, go to step 24). If connections are okay, go to step 20).  
16) Check for poor connections or connector damage at blower  
motor harness connector. Repair or replace as necessary. After repair,  
go to step 24). If connections are okay, go to step 21).  
17) Check for poor connections or connector damage at blower  
motor resistor harness connector. Repair or replace as necessary.  
After repair, go to step 24). If connections are okay, go to step 22).  
18) Check for poor connections or connector damage at A/C-  
heater control panel harness connectors. Repair or replace as  
necessary. After repair, go to step 24). If connections are okay, go  
to step 23).  
19) Repair Red wire between blower motor relay harness  
connector terminal A2 and I/P-1 fuse (40-amp) located in underhood  
fuse block. After repair, go to step 24).  
20) Replace blower motor relay. After repair, go to step 24).  
21) Replace blower motor. See BLOWER MOTOR under REMOVAL &  
INSTALLATION. After repair, go to step 24).  
22) Replace blower motor resistor. See BLOWER MOTOR RESISTOR  
under REMOVAL & INSTALLATION. After repair, go to step 24).  
23) Replace A/C-heater control panel. See  
A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. After repair,  
go to next step.  
24) Operate blower system to verify repair. If blower motor  
operates normally, repair is complete. If blower motor is still  
inoperative, return to step 2).  
REMOVAL & INSTALLATION  
WARNING: To avoid injury from accidental air bag deployment, read and  
carefully follow all SERVICE PRECAUTIONS and DISABLING &  
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY  
article in GENERAL SERVICING.  
A/C COMPRESSOR  
Removal (3.8L Engine)  
1) Disconnect negative battery cable from engine block ground  
stud. Discharge A/C system, using approved refrigerant  
recovery/recycling equipment. Remove serpentine drive belt. Disconnect  
electrical harness connector. Remove strap from compressor and  
condenser hose assembly.  
2) Raise and support vehicle. Remove compressor and condenser  
hose bolt. Disconnect compressor and condenser hose assembly. Discard  
"O" ring. Remove compressor bolts. Remove compressor and rear bracket  
(if necessary).  
Installation  
1) To install, reverse removal procedure. If compressor is  
being replaced, drain refrigerant oil from old compressor. Measure  
amount of oil from old compressor. If measured amount is less than one  
ounce, add 2 ounces to new compressor.  
2) If more than one ounce is drained from old compressor, add  
same amount to new compressor. Clean all fittings with mineral-base  
refrigerant oil. Lightly coat all seals with mineral-base refrigerant  
oil before assembling. Evacuate and charge A/C system.  
Removal (5.7L Engine)  
Disconnect negative battery cable. Discharge A/C system,  
using approved refrigerant recovery/recycling equipment. Raise and  
support vehicle. Remove serpentine drive belt and tensioner. Remove  
compressor and condenser hose bolt. Disconnect compressor and  
condenser hose assembly. Discard seal. Disconnect transmission oil  
cooler pipes from engine bracket. Disconnect compressor electrical  
connector. Remove compressor bolts. Remove compressor.  
Installation  
1) To install, reverse removal procedure. If compressor is  
being replaced, drain refrigerant oil from old compressor. Measure  
amount of oil from old compressor. If measured amount is less than one  
ounce, add 2 ounces to new compressor.  
2) If more than one ounce is drained from old compressor, add  
same amount to new compressor. Clean all fittings with mineral-base  
refrigerant oil. Lightly coat all seals with mineral-base refrigerant  
oil before assembling. Evacuate and charge A/C system.  
A/C-HEATER CONTROL PANEL  
Removal & Installation  
1) Disconnect negative battery cable. Remove center  
instrument panel trim plate. Remove A/C-heater control panel retaining  
bolts.  
2) Pull A/C-heater control panel out from dash sufficiently  
to disconnect wiring harness connectors, temperature control cable and  
vacuum harness. Remove A/C-heater control panel. To install, reverse  
removal procedure.  
BLOWER MOTOR  
Removal & Installation  
Remove right side instrument panel insulator. Disconnect  
blower motor harness connector. Remove blower motor retaining bolts.  
Remove blower motor. To install, reverse removal procedure.  
BLOWER MOTOR RESISTOR  
Removal & Installation  
Disconnect negative battery cable. Remove right instrument  
panel insulator. Pull carpet away from A/C-heater case assembly.  
Disconnect blower motor resistor electrical connector. Remove mounting  
bolt from blower motor resistor. Remove blower motor resistor. To  
install, reverse removal procedure.  
BLOWER MOTOR SWITCH  
Removal & Installation  
Remove A/C-heater control panel. See A/C-HEATER CONTROL PANEL  
. Pull off blower motor switch knob. Remove blower motor switch  
retaining screw. Remove blower motor switch from A/C-heater control  
panel. To install, reverse removal procedure.  
CONDENSER  
Removal & Installation  
1) Disconnect negative battery cable. Discharge A/C system,  
using approved refrigerant recovery/recycling equipment. Remove air  
intake duct and air cleaner assembly. Remove upper radiator shroud  
assembly.  
2) Raise and support vehicle. Remove compressor and condenser  
hose assembly fitting at condenser. Discard "O" ring. Lower vehicle.  
Remove accumulator tube. Remove radiator air upper baffle from  
condenser. Remove condenser.  
3) To install, reverse removal procedure. Lightly coat "O"  
rings with mineral-base refrigerant oil. Evacuate and charge A/C  
system.  
EVAPORATOR TUBE  
Removal  
Disconnect negative battery cable. Discharge A/C system,  
using approved refrigerant recovery/recycling equipment. Disconnect  
electrical connector at refrigerant pressure sensor. Remove strap from  
evaporator tube. Remove accumulator tube. See ACCUMULATOR. Remove  
evaporator tube fitting at accumulator and condenser. Remove  
evaporator tube and discard "O" rings.  
Installation  
To install, reverse removal procedure. Clean all fittings  
with mineral-base refrigerant oil. Lightly coat all seals with  
mineral-base refrigerant oil before assembling. Evacuate and charge  
A/C system.  
EVAPORATOR  
Removal  
1) Disconnect negative battery cable. Discharge A/C system,  
using approved refrigerant recovery/recycling equipment. Remove right  
instrument panel sound insulator panel. Drain cooling system. Remove  
heater hoses at heater core. Open glove box. Push sides of glove box  
and remove glove box. Remove heater core. See HEATER CORE.  
2) Remove temperature control cable at A/C-heater case.  
Remove bolts, located in engine compartment, from A/C-heater case.  
Slide A/C-heater case down to disengage upper case clip and A/C-heater  
case.  
3) Place a mat on passenger side floor to protect carpeting.  
Using a small hand saw, remove perforated section of A/C-heater case  
as one piece (DO NOT discard). Remove bolts and hoses retaining A/C  
evaporator. Slide evaporator to left. Remove evaporator from A/C-  
heater case. See Fig. 3.  
Fig. 3: Exploded View Of A/C-Heater Assembly  
Courtesy of General Motors Corp.  
Installation  
1) To install, reverse removal procedure. Transfer condensate  
screen to new evaporator. Using appropriate adhesive, install NEW  
evaporator core gasket in same position as original. Slide new  
evaporator to right until full seated in A/C-heater case.  
2) Apply sealer (not epoxy) between evaporator and evaporator  
upper and lower case. Using epoxy, glue perforated section of heater  
and A/C evaporator case to A/C-heater case. After epoxy dries, use  
thumb to grade sealant on inside and outside to ensure a water-tight  
seal.  
3) Slide temperature valve case upward into position until  
upper clip engages. Engage snap on left edge of A/C-heater case to  
distribution case. Refill cooling system. Evacuate and charge A/C  
system.  
HEATER CORE  
CAUTION: DO NOT use excessive force to remove heater hoses from heater  
core pipes. Heater core can be damaged.  
Removal  
Drain cooling system. Remove heater hoses from heater core  
pipes. Open glove box. Push sides of glove box and remove glove box.  
Remove heater module bolts and cover. Remove heater core bolt, heater  
core clamp and heater core.  
Installation  
To install, reverse removal procedure. Lubricate heater  
pipes. Verify seal is installed correctly by observing seal from  
inside engine compartment. If seal leaks, apply sealer between heater  
core pipes and evaporator housing. Refill cooling system.  
ACCUMULATOR  
Removal  
Disconnect negative battery cable. Discharge A/C system,  
using approved refrigerant recovery/recycling equipment. Remove  
accumulator tube fitting at accumulator. Remove accumulator tube, and  
discard "O" ring. Remove evaporator tube fitting at accumulator.  
Remove accumulator from bracket, and discard "O" ring.  
Installation  
1) If accumulator is being replaced, drain and measure amount  
of refrigerant oil in old accumulator. Add drained amount plus one  
fluid ounce of new refrigerant oil to new accumulator.  
2) Clean all fittings with mineral-base refrigerant oil.  
Lightly coat all seals with mineral-base refrigerant oil before  
assembling. Evacuate and charge A/C system.  
ORIFICE (EXPANSION) TUBE  
CAUTION: If vehicle is equipped with a pressure switch mounted near  
orifice tube location, remove switch before heating inlet  
tube to prevent damage to switch.  
Removal & Installation  
1) Discharge A/C system, using approved refrigerant  
recovery/recycling equipment. Remove evaporator tube. See  
EVAPORATOR TUBE. Using needle-nose pliers or orifice tube remover,  
remove orifice tube from evaporator tube.  
2) If removal of orifice tube is difficult, remove as much of  
the impacted residue as possible. Using a heat gun, apply heat 1/4" (7  
mm) from dimples on inlet pipe. DO NOT overheat evaporator tube.  
3) To install, reverse removal procedure. Lubricate new "O"  
ring with clean refrigerant oil prior to installation. DO NOT soak "O"  
ring, as this will cause it to expand. Insert short screen end of  
orifice tube first. Evacuate, charge, and leak test A/C system.  
TORQUE SPECIFICATIONS  
TORQUE SPECIFICATIONS  
Application  
Ft. Lbs. (N.m)  
Accumulator Hose Fitting At Evaporator ..................... 28 (38)  
Accumulator Tube Bolt ...................................... 10 (14)  
Compressor & Condenser Hose Bolt ........................... 24 (33)  
Compressor & Condenser Hose Fitting At Condenser ........... 12 (16)  
Compressor & Condenser Hose Fitting At Accumulator ......... 12 (16)  
Compressor Support Bracket Bolt  
Front (5.7L) ............................................. 37 (50)  
Rear  
3.8L ................................................... 22 (30)  
5.7L ................................................... 37 (50)  
Evaporator Tube Bolt At Condenser .......................... 12 (16)  
Evaporator Tube Bolt At Evaporator ......................... 12 (16)  
Evaporator Tube Fitting At Accumulator ..................... 12 (16)  
Generator Bracket  
5.7L  
Mounting Bolts ......................................... 37 (50)  
Rear Brace Nut ......................................... 24 (33)  
INCH Lbs. (N.m)  
Accumulator Bracket Clamp Bolt .............................. 53 (6)  
Compressor & Condenser Hose Clip Nut ........................ 71 (8)  
Compressor Low Pressure Cut-Off Switch ...................... 53 (6)  
Pressure Sensor ............................................. 53 (6)  
Refrigerant Service Valve .................................. 97 (11)  
Temperature Control Cable Screw ............................. 17 (2)  
WIRING DIAGRAMS  
Fig. 4: Manual A/C-Heater System Wiring Diagram (2000 Camaro &  
Firebird With 3.8L Engine)  
Fig. 5: Manual A/C-Heater System Wiring Diagram (2000 Camaro &  
Firebird With 5.7L Engine)  
Fig. 6: Manual A/C-Heater System Wiring Diagram (2001 Camaro &  
Firebird With 3.8L Engine)  
Fig. 7: Manual A/C-Heater System Wiring Diagram (2001 Camaro &  
Firebird With 5.7L Engine)  
A00063334  

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