Diagnostic Aids
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- The condition may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
- Inspect the air delivery system for the following conditions:
- A dirty HVAC air filter
- An obstruction to the airflow
- Air leaks
- Misaligned air ducts
- Broken or binding linkages or doors
Air Delivery Improper
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
Go to Step 3 | Go to Blower Motor Always On |
| 3 | Place the blower motor switch in each speed position. Does the blower motor operate in any of the speed positions? |
Go to Step 4 | Go to Blower Motor Inoperative |
| 4 | Does the blower motor operate in each speed position? | Go to Step 5 | Go to Blower Motor Malfunction |
| 5 |
|
Go to Step 6 | Go to Air Recirculation Malfunction |
| 6 |
|
Go to Diagnostic Aids | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 8 | Replace the HVAC control module. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? |
Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |