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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 134,987 (60,000–215,000)
8 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2009, 2011
22 people reported this problem
Viewing 1 - 12 of 12 problem details
my yukon blows hot and cold at the same time. only in the front of vehicle driver side cold & passenger side hot.
Rear heating vents only deliver cold air
AC on blowing hot air
I have to go to full hot to get heat...if I back off even a little, cold air blows out of the vents.
When the air conditioning is on the driver side will start blowing hot.
temp switches from cold to hot &heather only heats when it wants
Air-conditioning blows hot its full of freion.still.
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
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