Car Problem Reports

GMC Sierra 1500 Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail

GMC Sierra 1500 Problem
32 Reports
Me Too

Model Years Affected: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2009

Average Mileage: 107,746 mi (30,000 mi - 210,000 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.

  •  Rookie

    A/C only cold on passenger side. Drivers side blows hot. There is no adjustment on the drivers side for temp. If you turn off the truck and then restart, it might work for a bit or not.

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  • Visitor, , 114,000 mi

    This is a well documented problem as you can see by reading articles throughout various internet sites. For being the so called a "Professional Grade", I have had so many problems with my GMC, from the instrument cluster, steering column, bed liner, hubs, ABS, emissions, etc.... and now with the HVAC - I'd give my 2004 GMC Sierra a disappointing "F". GM needs to issue Campaign to correct this problems, since so many of their customers are experience problems due to their poor workmanship or inferior design.

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  • Visitor, , 75,000 mi

    Can't change heating/a/c temp unless I shut down truck and reset to desired temp and restart, then it goes to correct temp

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  • Visitor, , 164,322 mi

    When selecting where i want my air to go, it only comes through the vent at my feet and through the defrost. The dash vents do not blow any air. It seems like a common problem. Im gonna go ahead and replace the mode actuator!

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  • Visitor, , 210,000 mi

    system won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.

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  • Visitor, , 127,000 mi

    System won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.

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  • Visitor, , 151,000 mi

    Heat vent operation will only blow on the floor and windshield defrost. Does not change position when the nob is turned.

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  • Visitor, , 145,000 mi

    textbook problem like all others. Temp. adjuster knob when turned to cold would only blow hot all the time. Actuator is at fault.

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  • Visitor, , 63,000 mi

    heat only at 90 deg.

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  • Visitor, , 199,589 mi

    i have problems when i u the air or heater.i have to shut the car off for half hour before i can u the other

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