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 1500
Average mileage: 134,987 (60,000–215,000)
22 people reported this problem
2004 GMC Yukon XL 1500 162,000 mi, Visitor
Rear heating vents only deliver cold air
2003 GMC Yukon XL 1500 165,134 mi, Visitor
my yukon blows hot and cold at the same time. only in the front of vehicle driver side cold & passenger side hot.
2005 GMC Yukon XL 1500 100,000 mi, Visitor
AC on blowing hot air
When the air conditioning is on the driver side will start blowing hot.
I have to go to full hot to get heat...if I back off even a little, cold air blows out of the vents.
2004 GMC Yukon XL 1500 84,000 mi, Visitor
temp switches from cold to hot &heather only heats when it wants
All three climate zones (driver, front passenger, and rear) all blow hot air when the AC is on, and cold air when heat is on. It does not do this all the time, and switches back and forth from correct temp, to opposite. Also, the driver heated seat will come on at max temp at random times.
Heat or air don't blow out on the floor
2000 GMC Yukon XL 1500 211,223 mi, Visitor
Air-conditioning blows hot its full of freion.still.
2005 GMC Yukon XL 1500 145,000 mi, Visitor
when switching from heat to a/c the temp control is on 60 but there is hot air blowing out as if the heater is on.
2001 GMC Yukon XL 1500 215,000 mi, Visitor
rear a/c blows hot air even when air is on