HVAC Compressor Clutch Does Not Disengage
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
HVAC Compressor Clutch Does Not Disengage
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The A/C compressor clutch will not disengage when an A/C request has not been made and a Powertrain DTC has not been set. |
|||
| 1 | Did you perform the HVAC Diagnostic System Check? | Go to Step 2 | Go toDiagnostic System Check - HVAC Systems - Manual |
| 2 |
IMPORTANT:
The ambient air temperature must be above 3°C (38°F).
|
Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 | With a scan tool, observe the A/C Request parameter in the Powertrain data list 2. Does the scan tool indicate that the A/C Request parameter is NO? |
Go to Step 4 | Go to Step 6 |
| 4 | With a scan tool, observe the A/C Relay Command parameter in the Powertrain data list 2. Does the scan tool indicate that the A/C Relay Command parameter is OFF? |
Go to Step 5 | Go to Step 14 |
| 5 | Test the control circuit of the A/C compressor clutch relay for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 7 |
| 6 |
|
Go to Step 9 | Go to Step 13 |
| 7 | Remove the A/C compressor clutch relay. Does the A/C compressor clutch turn OFF? |
Go to Step 10 | Go to Step 8 |
| 8 | Test the A/C compressor clutch voltage supply circuit, at the A/C compressor clutch for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 11 |
| 9 | Test the A/C request signal circuit for a short to voltage. Refer toCircuit Testing
andWiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 12 |
| 10 | Inspect for poor connections at the A/C compressor clutch relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 15 |
| 11 | Inspect for poor connections at the harness connector of the A/C compressor clutch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 16 |
| 12 | Inspect for poor connections at the harness connector of the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 17 |
| 13 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 18 |
| 14 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 20 | Go to Step 19 |
| 15 | Replace the A/C compressor clutch relay. Refer to Compressor Relay Replacement
in Heating, Ventilation and Air Conditioning. Did you complete the replacement? |
Go to Step 20 | - |
| 16 | Replace the A/C compressor clutch. Refer toCompressor Replacement
in Heating, Ventilation and Air Conditioning. Did you complete the replacement? |
Go to Step 20 | - |
| 17 | Replace the HVAC control assembly. Refer to HVAC Control Assembly Replacement (Chevrolet) or HVAC Control Assembly Replacement (Pontiac) . Did you complete the replacement? |
Go to Step 20 | - |
| 18 | Replace the BCM. Refer to Body Control Module Replacement
in Body Control System. Did you complete the replacement? |
Go to Step 20 | - |
| 19 |
IMPORTANT:
Perform the programming procedure for the PCM. Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
in Engine Controls-2.2L (L61).Did you complete the replacement? |
Go to Step 20 | - |
| 20 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |