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GMC Yukon XL 2500 Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail

 
GMC Yukon XL 2500 Problem
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Model Years Affected: 2000, 2001, 2002, 2003, 2004

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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.

  • Visitor, , 85,000 mi

    Driver's side A/C switches from cooling to full-on heat, but thermostat seems to work, because it increases fan speed to attempt to lower cabin temperature, by blowing blazing hot air!

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