GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the Control Assembly Description and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

2

A fault has occurred in the vacuum selector, vacuum source, vacuum actuators, vacuum hoses to actuators, linkage from actuators to values, or faulty valves. Inspect the system for these conditions.

Were any leaks found?

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Go to Step 4

Go to Step 3

3

Refer to Air Delivery Improper for further diagnosis.

Is the repair complete?

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Go to Step 5

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4

Replace the A/C Control Assembly. Refer to Control Assembly Replacement .

Is the repair complete?

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Go to Step 5

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5

Verify that the system operates properly .

Does the system operate properly ?

--

System OK

Go to Symptoms