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HVAC Systems - Manual

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  1. 2. The A/C compressor relay output is disabled if engine coolant temperature is above 121°C (250°F).
  2. 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.

  3. 6. The HVAC control assembly 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: Diagnostic Table (HVAC Compressor Clutch Does Not Engage) (Steps 1-5)
    G01418821Courtesy of GENERAL MOTORS CORP.
Fig 2: Diagnostic Table (HVAC Compressor Clutch Does Not Engage) (Steps 6-16)
G01418822Courtesy of GENERAL MOTORS CORP.
Fig 3: Diagnostic Table (HVAC Compressor Clutch Does Not Engage) (Steps 17-29)
G01418823Courtesy of GENERAL MOTORS CORP.
Fig 4: Diagnostic Table (HVAC Compressor Clutch Does Not Engage) (Steps 30-36)
G01418824Courtesy of GENERAL MOTORS CORP.
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