Compressor Clutch Does Not Engage
HVAC COMPRESSOR CLUTCH DOES NOT ENGAGETEST DESCRIPTION
Steps 1 - 3:
Steps 4 - 6:
Steps 7 - 10:
Steps 11 - 15:
Steps 16 - 22:
Steps 23 - 29:
Steps 30 - 35:
Steps 36 - 39:
The number(s) below refer to the step number(s) on the diagnostic table.
2. The A/C compressor relay output is disabled if engine coolant temperature is above 121°C (250°F).
3. Placing the mode switch in any position other than OFF, along with placing the air temperature control switch in a cold setting, activates A/C operation. For the purpose of this and future steps where A/C operation is necessary, bi-level mode is used for consistent testing.
5. The HVAC control assembly is inoperative when the module does not respond to any operator control requests.
24. Ensure to test both A/C request signal circuits of the A/C high pressure sensor for the listed conditions.