GM Service Manual Online
For 1990-2009 cars only

Auxiliary Blower Motor Always On Body Type VIN 3

Step

Action

Yes

No

Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The auxiliary blower motor operates with the auxiliary blower motor switch in the OFF position.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Turn the auxiliary HVAC controls OFF.

Is the auxiliary blower motor OFF?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the auxiliary HVAC control module.

Is the auxiliary blower motor OFF?

Go to Step 4

Go to Step 5

4

Inspect for poor connections at the harness connector of the auxiliary HVAC control module. Refer to Wiring Repairs and Connector Repairs .

Did you find and correct the condition?

Go to Step 7

Go to Step 6

5

Repair a short to voltage in the appropriate auxiliary blower motor speed control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 7

--

6

Replace the auxiliary HVAC control module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3