Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Suburban 2500

Problem Description and Possible Solution

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

Problem Data
RepairPal Verified
Average mileage: 177,500 (130,000–225,000)
8 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999
10 people reported this problem
Viewing 1 - 2 of 2 comments
Cabin flapper door doesn't activate, stuck in position for HEAT. A/C ineffective.
the only location I got air is from the floor, if I unplugged one of the other actuators and left the fan off I could control where air would go, then I unplugged that actuator and can run the fan as normal. replaced both blend door and main actuators. will replace heat controller actuator this weekend.