GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check the HVAC fuse in the fuse block.

Is the HVAC fuse open?

--

Go to Step 2

Go to Step 3

2

Locate and repair a short to ground in circuit 41 (BRN).

Is the repair complete?

--

Go to Step 5

--

3

There is a fault in the vacuum source, vacuum actuators, vacuum hoses to actuators, linkage from actuators to values, or faulty valves. Refer to Vacuum System for further diagnosis.

Is the action complete?

--

Go to Step 5

Go to Step 4

4

Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

Go to Step 5

--

5

Verify that the system operrates properly.

Does the system operate properly?

--

System OK

Go to Symptoms