Compressor Clutch Does Not Engage

HVAC COMPRESSOR CLUTCH DOES NOT ENGAGE

TEST DESCRIPTION

Steps 1-9:

Steps 10-22:

Steps 23-38:

Step 39:

The numbers below refer to the step numbers on the diagnostic table.
2. The A/C compressor relay output is disabled if engine coolant temperature is above 123°C (253°F). The instrument panel engine coolant gage will indicate overheating.
3. Place the mode switch in any position except OFF, and place the air temperature control switch in a cold setting. Use the bi-level mode for consistent testing of the A/C system operation.
6. The HVAC control assembly is inoperative if the assembly does not respond to any operator control requests.
14. Be sure to verify the engine control module (ECM) engine grounds are secure and clean.