Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Sierra 1500

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.

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Average mileage: 109,156 (10,200–311,149)
11 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2009, 2011, 2014
54 people reported this problem
32 people shared problem details
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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1999 GMC Sierra 1500164,322
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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1999 GMC Sierra 1500127,000
System won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.
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2004 GMC Sierra 1500114,000
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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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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2000 GMC Sierra 1500210,000
system won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.
2001 GMC Sierra 1500151,000
Heat vent operation will only blow on the floor and windshield defrost. Does not change position when the nob is turned.
2000 GMC Sierra 1500145,000
textbook problem like all others. Temp. adjuster knob when turned to cold would only blow hot all the time. Actuator is at fault.
heat only at 90 deg.
2000 GMC Sierra 1500199,589
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
2004 GMC Sierra 1500113,254
a/c blows hot driver side/cold passenger side. may start cold both sides then driver side starts blowing hot and getting hotter. passenger side continues to blow cold air. tried recalibration, pulling fuses, restarting, stopping vehicle turning eng off and restarting eng and then a/c same results.
the air flow for both hot and cold only goes to the feet and the defrost
2004 GMC Sierra 1500120,000
Air will be blowing cold and then just start blowing hot. Switching the truck off and back on usually helps.
Ac blows cold on passenger side and hot on driver side this is the 3rd time I have had to caring it back unreal need a recall
Driver's side works as designed, Passenger side blows hot air? GMC dealer does not acknowledge any history of same problem. Dealer will charge $125.00+ for diagnostic and no fix, depending on the diagnostic will determine if can be fixed?
ac not working
Air blows out the vents for about 20 mins, then it starts blowing out slower and soon it is blowing out in the ducts, but not coming out anywhere, (vents, defrost or the feet ) .
Heat only on passenger side and no defrost either on drivers side. A/c comes on only to go off after a few minutes. //can turn off truck and reset a/c to come on but does go off again after a few minutes. Blows very cold. A/C works perfectly in late PM and very early AM hours. Will not work in daylight hours. Changed drivers blend door and climate control panel.
Drivers side a/c will blow hot air while passenger side will blow cold on any setting. Truck has automatic climate control googled for a fix and found this site. Repairs not done yet.
2005 GMC Sierra 1500160,000
A/c blows hot air sometimes. I can shut the truck off, then restart and it is fine. How do I fix this?
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