Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Yukon XL Denali

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: 128,257 (8,700–312,000)
11 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011
147 people reported this problem
79 people shared problem details
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?
AC onm, blows heat on drivers side and cold everwhere else.
A/C blows cold on driver while pass gets heat... sometimes reverses in the winter. With or without a/c.
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.
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!
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
2003 GMC Yukon Denali XL started blowing air out of defrost after a battery change. Hopefully its just a bad mode actuator.
Cold air blows when heater is on even after 20 minutes of warming up.
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.
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?
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.
Air conditioning is on but the air coming out of the vents is heated air. It does the opposite sometimes as well. I will have the heat on and the air coming out of the vents is cooled air.
While on cooling mode, will switch to full heat on driver side, sometimes both sides. Not responsive to temperature adjustment.
When th heat is on in the back it blows cold do I fix it.
Heat blow cold air ,and I put anti freeze in it
Last year I replaced the blend valve because the driver side would throw hot air while the rest of the car was blowing cool air Since then the AC works Great, however now I only get AC on the drivers side, no heat
Heat is blowing from drivers side and cold air is blowing from passengers side.
Heat won't blow out of the floor vents.
my front window defroster is blowing out cold air. the heat sometimes blows out cold cool air also.
No heat or intermittent warm air even when both passenger and driver temperature setting are at 90 degrees.
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