GMC Chevrolet Camaro 1998 Service Manual page 131

HVAC
HVAC System - Manual 1-21
Blower Motor Always On (cont'd)
..
Step
Action Value(s) Yes No
)
Connect a test light at the blower motor relay connector
6
terminal C1 and ground.
-
Does the test light illuminate?
Go to Step 7
Go to Step 8
7
Repair a short to B+ in circuit 65.
- -
Is the repair complete?
Go to Step 9
Replace the blower motor reiay. Refer to Blower Motor
8
Relay Replacement
- -
Is the repair complete?
Go to Step 9
1. Turn the ignition switch to the OFF position.
Go to HVAC
9
2. Reconnect all connectors /components removed.
-
Blower Controls
-
Have all the repairs been made? System Check
System Performance Test
System Performance Test
Step Action
Value(s) Yes
No
DEFINITION: The performance test measures the air conditioning system opera.ting efficiency. The test measures and
compares the following areas:
• The pressures at the high-pressure and low-pressure side.s of the refrigeration system
• The temperature of the air being discharged into the passenger compartment
• The evaporator temperature
Perform a functional check in order to ensure that the air
distribution system valves are functioning properly. When
)
1
functioning properly the valves route all of the air that
passes through the evaporator to the outlets. Refer to
- -
Functional Check.
Are the valves functioning properly?
Go to Step 2
1. Rotate the temperature knob from full COLD to
full HOT and back to full COLD.
2
2. Listen for the temperature valve to seat in both the
-
full HOT and full COLD .position. A thud noise
indicates that the valve is seated.
Does the temperature valve seat .. in b.oth positions?
Go to Step 3 Go to Step 9
1. Park the vehicle indoors.
2. Close the doors and the windows.
3. Select the full. COLD, MAX A/C mode ..
4. Select the HIGH blower motorspeed.
3
5. Place the vehicle in park (automatic transmission).
-
6. Set the parking brake (manual or automaUc
transmission).
7. Start the engine.
Does the compressor engage? Go to Step 4 Go to Step 5
1. Install the scan tool with the powertrain cartridge.
2. Select the field service mode.
4
3. Use the scan tool to energize the cooling fans.
-
4. Inspect the cooling fan operation.
'
Are both cooling fans operating?
Go to Step 7 Go to Step 6
5
Refer to Engine Controls for A/C Compressor Diagnosis.
-
- -
6
Repair the cooling fan circuit.. Refer to Engine Controls.
- -
Is the repair complete?
System OK