Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Yukon XL 1500

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: 139,373 (60,000–215,000)
8 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2009, 2011
24 people reported this problem
14 people shared problem details
Rear heating vents only deliver cold air
my yukon blows hot and cold at the same time. only in the front of vehicle driver side cold & passenger side 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.
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 the heat to work. If I lower the temp at all, cold air blows out of the vents.
Tried to on the heater cause of extra cold and I find out that it's not blowing out any heat nor any AC in the front vent at all the back rear vent still works but the front does not. I want to fix it myself hopefully I can save a Lot of money. Whats all that I need?
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.
temp switches from cold to hot &heather only heats when it wants
Heat or air don't blow out on the floor
Air-conditioning blows hot its full of freion.still.
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.
rear a/c blows hot air even when air is on
Acuator failed had replaced cost $600
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