Compressor Clutch Does Not Engage

HVAC COMPRESSOR CLUTCH DOES NOT ENGAGE

DIAGNOSTIC AIDS




Refer to the table for reference of air conditioning (A/C) refrigerant high side pressure sensor signal reading conversion from the DMM voltage value to psi value.

TEST DESCRIPTION

Step 1 - Step 8:

Step 9 - Step 19:

Step 20 - Step 33:

Step 34 - 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 128°C (262°F). The instrument panel engine coolant indicator 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 module is inoperative if the module does not respond to any operator control requests.