Diagnosis And Testing - A/C Heater Control
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
Satisfactory heater and air conditioner performance depends upon proper operation and adjustment of all operating controls and refrigeration system components. Use of the DRB-III is required for diagnosis and testing, follow instructions on DRB-III.