GM Service Manual Online
For 1990-2009 cars only

Improper Air Delivery

Step

Action

Value(s)

Yes

No

1

Was the Air Delivery System Check performed?

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Go to Step 2

Go to Air Delivery System Check

2

    • Install the scan tool.
    • Select the actuator tests from the Air Conditioning SPECIAL FUNCTIONS menu.
    • Select one actuator test at a time and command the actuator from 0% to 100%.
    • Monitor the air flow when commanding the selected actuator (e.g., good air flow should be felt when the floor actuator is commanded to 100% and none when commanded to 0%.)

Does the scan tool display the status ACTIVE when the actuator is commanded?

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Go to Step 3

Go to Step 4

3

Is good air flow felt when the actuator selected is commanded from 100% to 0%?

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System OK

Go to Step 4

4

    • Check the actuator that failed for mechanical binding. Repair as needed.
    • Check the circuit wiring between the heater and A/C control and the actuator. Repair as needed. Refer to the applicable DTC table related to the actuator for assistance.

Is the repair complete?

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System OK

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