Diagnostic Aids
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
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 |
| 2 |
|
Go to Step 3 | Go to Blower Motor Malfunction |
| 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 Malfunction |
| 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
. 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
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 |