GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Were you sent here by the Symptoms Table?

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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:

    •  Control Assembly Replacement for the manual HVAC system
    •  Control Assembly Replacement for the Automatic HVAC system.

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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System OK

Go to Symptoms