Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: A/C compressor clutch will not disengage when no A/C request has been made and no Powertrain DTC has been set. SCHEMATIC REFERENCE: HVAC Compressor Control Schematics | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Important:: Verify that ambient temperature is above 4° C (40° F) before testing.
Does the system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Are both the low and high side pressures within 103 kPa (15 psi) of the ambient pressure? | -- | Go to Step 4 | Go to Leak Testing in Heating, Ventilation and Air Conditioning |
4 |
Does the scan tool indicate the compressor clutch is being requested ON by the Powertrain Control Module (PCM)? | -- | Go to Step 6 | Go to Step 5 |
5 | Does the scan tool indicate the compressor clutch being requested ON by the heater and A/C programmer? | -- | Go to Step 12 | Go to Step 7 |
6 |
Important:: Perform the reprogramming procedure for the PCM. Replace the Powertrain Control Module. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Did you complete the replacement? | -- | Go to Step 13 | -- |
7 |
Does the A/C clutch disengage? | -- | Go to Step 9 | Go to Step 8 |
8 | Repair the A/C compressor clutch supply circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 13 | -- |
9 | Use a DMM in order to test resistance of the A/C clutch relay control circuit. Refer to Circuit Testing in Wiring Systems. Does the resistance measure at the specified value? | 0 ohms | Go to Step 10 | Go to Step 11 |
10 | Replace the A/C compressor relay. Did you complete the replacement? | -- | Go to Step 13 | -- |
11 | Repair the A/C clutch relay control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 13 | -- |
12 | Replace the heater and A/C programmer. Refer to Control Assembly Replacement . Did you complete the replacement | -- | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
