One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.
Problems for specific Buick Park Avenue years:
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Most reported 1997 Buick Park Avenue problems
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.