Car Problem Reports

GMC Sierra 2500 HD Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail

 
GMC Sierra 2500 HD Problem
32 Reports
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Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009

Average Mileage: 105,952 mi (36,000 mi - 306,007 mi)

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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, , 67,800 mi

    Air only comes out dash vents. Changing to floor or defrost switch position does not change air flow.

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  • Visitor, , 306,007 mi

    With the A/C on, the drivers side turns to high heat at intermittent times. When the mileage was low, I'd find a pot hole or large lane marker and the little jolt would turn off the heat. Now we are at full stop, shut it off, remove the key and restart. I can hear a small "clicking" sound coming from the dash from time to time.
    While I love my GMC Duramax, I hate this problem. Any suggestions on a good repair manual that will cover the A/C systems and circuitry.

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  • Visitor, , 113,000 mi

    Blows cold air on driver's side and hot air on passenger side. Should heat both sides.

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  • Visitor, , 83,000 mi

    When A/C is turned on, occassionally blows hot air instead. Restart of the engine will usually solve the problem.

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  • Visitor, , 115,000 mi

    Poor airflow. Does not transition through upper vents when selected.

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  • Visitor, , 63,000 mi

    passenger side blows out hot air when should be blowing cold air

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  • Visitor, , 72,566 mi

    heater actuator will not switch to defrost or floor

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  • Visitor, , 205,000 mi

    Bought used and wasn't told of the problem.....didn't need defrost until two days ago (2 months after purchasing)and it's stuck on floor and panel vents. Will not go to floor only, defrost only, or panel vent only.

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  •  Rookie

    Air only comes out from the bottome vents, and every time i try to change the temp it doesn't change by much. For example if i turn the knob from lets say 70-75 the numbers change and then the revert back to 70 or 68.

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  • same no heat lt side

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