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.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Oldsmobile Regency
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Bought the car used and had to have the AC repaired to the tune of about 800.00 at the garage. 3 years later, I gave the car to my daughter and before doing so, had the dashboard removed to replace some thing that controls the opening and closing of vents as well as to support the hoses that deliver air. That was about 1100.00 at the garage. within 3 months, my daughter began to notice that only the passenger side got cool air and the driver side got warm air. Now 3 months after that, the air - regardless of temperature - trickles out when the fan is on high. Presumably the hoses have fallen again and obviously there is something wrong with the temperature settings as it does not work the same on both sides. Also, as we went through winter (short winter here - thankfully) she noticed that her defrosters do not work, as no air was blowing out of the vents. Obviously the hoses all fell again.
Climate control heat blinked upon startup. Had to replace both passenger and driver blend door actuators.
drivers will not blow cold air and the heater will only work on deforster
no air blowing for bi-level but get cold air from drivers side lower and warm air from passenger side lower. I'm told I need to replace "Air Delivery Mode Door Actuator/s"