GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the Defogger Symptoms?

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Go to Step 2

Go to Symptoms

2

Replace the Heater A/C Control. Refer to one of the following procedures:

    • For the C60, refer to Control Assembly Replacement in HVAC System - Manual.
    • For the CJ2, refer to Control Assembly Replacement in HVAC System - Automatic.

Is the repair complete?

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Go to Step 3

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3

Verify that the system operates properly.

Does the system operate properly?

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Go to Symptoms

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