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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. The A/C compressor relay output is disabled if engine coolant temperature is above 124°C (255°F) for the LG8 and 121°C (250°F) for the L36.
  2. 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.
Fig 1: HVAC Compressor Clutch Does Not Engage - Diagnostic Table (Steps 1 - 6)
G01482275Courtesy of GENERAL MOTORS CORP.
Fig 2: HVAC Compressor Clutch Does Not Engage - Diagnostic Table (Steps 7 - 15)
G01482276Courtesy of GENERAL MOTORS CORP.
Fig 3: HVAC Compressor Clutch Does Not Engage - Diagnostic Table (Steps 16 - 26)
G01482277Courtesy of GENERAL MOTORS CORP.
Fig 4: HVAC Compressor Clutch Does Not Engage - Diagnostic Table (Steps 27 - 37)
G01482278Courtesy of GENERAL MOTORS CORP.
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