Compressor Clutch Does Not Engage

HVAC COMPRESSOR CLUTCH DOES NOT ENGAGE

TEST DESCRIPTION

Steps 1 - 9:

Steps 10 - 21:

Steps 22 - 36:

Steps 37 - 42:

The numbers below refer to the step numbers on the diagnostic table.
2. 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.
11. The A/C compressor relay output is disabled if engine coolant temperature is above 121°C (250°F).