Car Problem Reports

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

GMC Yukon XL Denali Problem
96 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011

Average Mileage: 123,668 mi (8,700 mi - 312,000 mi)


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, , 93,000 mi

    AC onm, blows heat on drivers side and cold everwhere else.

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  • Visitor, , 150,000 mi

    Heater blows hot on passenger side and cold on drivers side. dont get heat on defrost at dash either. What do I need to have replaced?

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  • Visitor, , 74,000 mi

    A/C blows cold on driver while pass gets heat... sometimes reverses in the winter. With or without a/c.

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  •  Rookie

    Front panel doesn't blow any heat or a/c. Very little heat/ac comes from the front floor vents. Only works in defrost, rear heat/ac works good.

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  •  Rookie

    While my a/c is running, for no apparent reason the heater will kick on full blast. And just within
    the last few months when this occurs, at the same time, my seat heater on the driver side will
    mysteriously turn on High. When I realize that my seat is blazing hot & try to turn
    off the seat heater, it continues to turn right back on like 6-10 times in a row...every time I turn it
    off, within 1-2 minutes it turns right back on! This is NO Fun to deal with while I am driving in traffic or on the highway, especially when it's well over 100* outside!! Any possible explanation would be greatly appreciated! Thank you

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  • Visitor, , 130,000 mi

    2003 GMC Yukon Denali XL started blowing air out of defrost after a battery change. Hopefully its just a bad mode actuator.

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  • Visitor, , 118,000 mi

    While driving with the a/c on, the front driver vent will suddently blow heat. All other vents including the rear are fine and still blowing cold! I have to stop the car, turn the engine off and restart the vehilce. It will temporarily fix the problem, but it will occur again while driving!

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  • Visitor, , 102,000 mi

    In AC or heat mode. Drivers side blows opposite of passenger and rear temp. Have had issues with climate control since purchased new on 04.

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  •  Rookie

    Rear a/c and heat not changing to heat staying cold and not changing from ceiling to floor. Front drivers side keeps changing from hot to cool and back again without touching the controls. help, help?

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  • Visitor, , 101,000 mi

    AC worked perfectly until this morning when it switched to blowing HIGH heat on the driver side within a few minutes after starting. Not sure about the other vents.

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