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: 129,712 (8,700–312,000)
158 people reported this problem
86 people shared problem details
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 Denali93,000Visitor
AC onm, blows heat on drivers side and cold everwhere else.
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.
2005 GMC Yukon XL Denali147,000Visitor
Cold air blows when heater is on even after 20 minutes of warming up.
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 Denali74,000Visitor
A/C blows cold on driver while pass gets heat... sometimes reverses in the winter. With or without a/c.
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.
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 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.
2004 GMC Yukon XL Denali160,000Visitor
When th heat is on in the back it blows cold air.how do I fix it.
2003 GMC Yukon XL Denali262,369Visitor
Heat blow cold air ,and I put anti freeze in it
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.
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.
2011 GMC Yukon XL Denali104,000Visitor
Dial air isn't working. Heat on passenger side set at 90 degrees, and blowing cold air on feet and dash.
2004 GMC Yukon XL Denali163,991Visitor
Front blows cold while A/C is on, rear blows hot air.
2004 GMC Yukon XL Denali112,000Visitor
Fixed the water pump and thermometer, then was blowing cold air. They then replaced the heater core but the car is still taking a long time and not heating up to tempature
A/c turns hot while driving, and heater now only blows air no heat.
2003 GMC Yukon XL Denali200,000Visitor
AC ONLY BLOWS THRU DRIVER RIGHT VENT,OTHER BEARLY BLOW,REAR AC ONLY BLOWS COLD
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?
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