Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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 AND POOR CONNECTIONS .
- Inspect the air delivery system for the following conditions:
- A dirty HVAC air filter, if applicable
- An obstruction to the airflow
- Air leaks
- Misaligned air ducts
- Broken or binding linkages or doors