Diagnostic Aids

WARNING: This page is about a different car, the 2007 Hummer H2. 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 .
The air temperature actuators can be calibrated. Refer to Re-Calibrating Actuators .
If the door actuators are out of the calibrated range the auto recirculation function will not work. The vehicle operator must place the HVAC controls to the recirculation position manually. Ensure to perform an actuator recalibration to correct this condition.