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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 number(s) below refer to the step number(s) on the diagnostic table.

8. Observe the Vacuum Solenoid parameters to verify that the appropriate solenoids are energized for their respective modes. In Vent mode, solenoid 3 is ON. In Defrost mode, solenoids 1 and 3 are ON-Please note that the Defrost switch should be activated in this mode. In Vent/Recirc, solenoids 3 and 4 are ON-Note that the Recirc switch should be activated in this mode. In Heater mode, solenoids 2 and 3 are ON. In Recirc mode solenoids 2, 3, and 4 are ON. In Def/Heater mode, solenoids 2 and 5 are ON.

10. Test the solenoid control circuit of the solenoid that does not click ON and OFF. Verifies that the HVAC control module is providing ground to the solenoid in the vacuum control assembly.

11. Tests if ground is constantly being applied to the vacuum control assembly.

Fig 1: Air Delivery Improper (Steps 1- 7)
G01569005Courtesy of GENERAL MOTORS CORP.
Fig 2: Air Delivery Improper (Steps 8 - 19)
G01569006Courtesy of GENERAL MOTORS CORP.
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