Diagnostic Aids
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the auxiliary air temperature door and the auxiliary air temperature actuator for the following conditions:
- A misaligned auxiliary air temperature actuator.
- Broken or binding linkages or auxiliary air temperature door.
- An obstruction that prevents the auxiliary air temperature door from operating within its full range of motion.
- Missing seals to the auxiliary air temperature door.
- Misaligned seals to the auxiliary air temperature door.