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.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Yukon XL Denali
Average mileage: 124,913 (8,700–312,000)
118 people reported this problem
62 people shared problem details
2004 GMC Yukon XL Denali93,000Visitor
AC onm, blows heat on drivers side and cold everwhere else.
2005 GMC Yukon XL Denali150,000Visitor
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?
2004 GMC Yukon XL Denali74,000Visitor
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 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 XL Denali130,000Visitor
2003 GMC Yukon Denali XL started blowing air out of defrost after a battery change. Hopefully its just a bad mode actuator.
2004 GMC Yukon XL Denali118,000Visitor
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!
2004 GMC Yukon XL Denali102,000Visitor
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?
2004 GMC Yukon XL Denali101,000Visitor
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.
2003 GMC Yukon XL Denali174,000Visitor
While on cooling mode, will switch to full heat on driver side, sometimes both sides. Not responsive to temperature adjustment.
2005 GMC Yukon XL Denali147,000Visitor
Cold air blows when heater is on even after 20 minutes of warming up.
2003 GMC Yukon XL DenaliVisitor
Heat and air coming out of defrost instead of front vents
2005 GMC Yukon XL Denali148,254Visitor
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.
2009 GMC Yukon XL Denali204,000Visitor
my 2009 Yukon Denali Driver side ac is cooling but passenger side is blowing hot air
2003 GMC Yukon XL Denali200,000Visitor
hot air in front.but kool air in the back?? Recharged.compressor won't run unless hot wired.
2004 GMC Yukon XL Denali140,000Visitor
The passinger two air vents up front blow out hot air.
2004 GMC Yukon XL Denali123,875Visitor
AC on delivers heat on driver side, cool air on passenger side. Mix door actuator suspected.
2005 GMC Yukon XL Denali111,000Visitor
Hot on passenger side cold on driver side
2004 GMC Yukon XL Denali112,000Visitor
ac intermittently blows heat on drivers side while still cooling the passenger side and switches between front defog, vents and floor
A rattling noise may develop from the AC belt tensioner. This can be caused by an internal faul...
Why doesn't heater blow on drivers side floor, when passenger works fine?
I just realized yesterday on my Yukon Denali 2003 that A/C in the front is cold but the rear bl...
The rear a/c in my truck is not cooling. When I turn the air on it blowes out warm air while th...
Rear ac not blowing but front is blowing cold air