GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

With the HVAC control head connector Disconnected, Test the Recirculation feed circuit for continuity to ground. Refer to circuit testing in Wiring Systems.

Did you find a short to ground?

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Go to Step 3

Go to Step 2

2

Replace the HVAC Control Assembly. Refer to HVAC Control Assembly in Heating Ventilation and Air Condition.

--

System OK

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3

Repair short to ground in the Recirculation feed circuit. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

System OK

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