Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. 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.

2. The A/C compressor relay output is disabled if engine coolant temperature is above 121°C (250°F) for the L36/L67 and 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.

Fig 1: HVAC Compressor Clutch Does Not Engage (Steps 1 - 4)

Courtesy of GENERAL MOTORS CORP.

Fig 2: HVAC Compressor Clutch Does Not Engage (Steps 5 - 14)

Courtesy of GENERAL MOTORS CORP.

Fig 3: HVAC Compressor Clutch Does Not Engage (Steps 15 - 26)

Courtesy of GENERAL MOTORS CORP.

Fig 4: HVAC Compressor Clutch Does Not Engage (Steps 27 - 34)

Courtesy of GENERAL MOTORS CORP.