Compressor Clutch Does Not Engage

HVAC COMPRESSOR CLUTCH DOES NOT ENGAGE

TEST DESCRIPTION

Steps 1 - 6:

Steps 7 - 15:

Steps 16 - 25:

Steps 26 - 36:

The numbers below refer to the step numbers on the diagnostic table.
2. The air conditioning (A/C) compressor relay output is disabled if engine coolant temperature is above 124 °C (255 °F) for the LG8.
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.
6. The HVAC control module is inoperative when the module does not respond to any operator control requests to enable the A/C compressor. The blower motor may still operate independent of the A/C controls.