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: 121,268 (30,000–311,149)
8 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2009
44 people reported this problem
26 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.
22 people like thisFlag inappropiate
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!
13 people like thisFlag inappropiate
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
12 people like thisFlag inappropiate
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.
10 people like thisFlag inappropiate
1999 GMC Sierra 1500127,000
System won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.
8 people like thisFlag inappropiate
2000 GMC Sierra 1500210,000
system won't deliver to air flow to the proper place, ie defrost,floor,or ac vents.
7 people like thisFlag inappropiate
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.
4 people like thisFlag inappropiate
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.
4 people like thisFlag inappropiate
heat only at 90 deg.
4 people like thisFlag inappropiate
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
2 people like thisFlag inappropiate
the air flow for both hot and cold only goes to the feet and the defrost
1 person likes thisFlag inappropiate
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?
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.
2003 GMC Sierra 1500311,149
Hold on the driver side and hot on the passenger side. Looking for answers.
2005 GMC Sierra 1500190,000
once in a while either the driver side or the passenger side vents blow hot air even when the AC is on. Still happens every so often
2004 GMC Sierra 1500155,000
Cold on passenger side, hot on drivers. Leave off for awhile and runs ok. Already paid to replace actuator door.
2004 GMC Sierra 1500111,000
After replacing batt. the air came out of the defrost only. Happened once before when I disconnected the neg. batt. cable. I gained access to the air direction valve, removed the motor, installed the motor on the actuator shaft and turned the motor by hand until the screw holes lined up and then installed the screws. All worked well until I had to replace the batt. I will do the same again.
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.
A/C blows cool air, then suddely switched to hot on drivers side only. I have to shut off engine and restart to correct a/c.
Driver's side temperature control actuator causes hot air to blow when AC is on. Have to shut off engine and restart to get cool air on driver's side.
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