GMC Yukon XL Denali Problem Report

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

(102 reports)

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.

AC onm, blows heat on drivers side and cold everwhere else. -
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? -
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 Denali XL started blowing air out of defrost after a battery change. Hopefully its just a bad mode actuator. -
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! -
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. -
While on cooling mode, will switch to full heat on driver side, sometimes both sides. Not responsive to temperature adjustment. -
Cold air blows when heater is on even after 20 minutes of warming up. -
Hot air started blowing when AC on. Turning off car and turning back on temporarily fixes problem. -
Air conditioning goes from normal operation to blast furnace temperature without warning. -
Hot driver cold passenger..intermitent..??? -
Air not circulating in front, back air blows, but cold only -
2 years ago (in Middle Georgia in July) AC blows on passenger side and heat blows on driver's side. Took it to the dealer. They could not find the problem. Afterwards, the AC worked properly for another year. Great. Last year this happened a few times, but would always revert to working properly. Winter isn't an issue because the heater works properly. Now that we have had some warm days and AC is needed - the problem has returned and is consistently malfunctioning. Will take to the dealer to repair. -
blows hot air on the drivers side and cold on passengers side when the ac is on,in the back it blows the selected temp. when the heat is on it blows hot on both sides. -
I hope there is someone out there who can help me with this problem. 2003 GMC XL 1500. Here is what mine is doing. I have dual climate control (drivers side & passenger with a temp knob for each side). My system has been acting wacky for at least a year now. Here is what it is doing......... It will produce cold air only unless I put the temperature knob (or knobs) to 90. At 90 it blasts hot air at full fan speed. To lower the air flow I have to use the regular fan button by lowering it. It does the same thing on both the Driver and Passenger sides. I have tested cycling through all of the various button choices (defrost only, face only, face and foot, circulate inside air, etc.) and all of them work fine and air flows through each.......If I put both temperature controls, or either one of them for that matter to 89 degrees or less it blows only cold air. However, as I noted above, when I put one or both of the temperature control knobs to 90 degrees, each one blows hot air only. I've tried several suggestions I've read throughout the internet like disconnecting the battery, taking out various fuses and starting the vehicle then reinstalling them, driving around and cycling though the various buttons, and even more from various internet sites to no avail. I hope I don't have to spend a ton o money on this as it works......... but doesn't work the way it is supposed to. Any help (detailed steps please) would be appreciated. -
I have had this problem since I bought this vehicle new. I have taken back to my dealer tice and they never fixed it. I took it back when it was new and they didn't fix it. The heater blows cold air on the drivers side and hot air on the passenger side. I freeze in the winter when I need heat. This is a discusting situation. Bert Pearson P.S. How do you fix it? My car is an Envoy Danali -
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