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.Google+
Car Problem Reports
Cadillac Escalade EXT Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail
Cadillac Escalade EXT Problem
Visitor, 2003 Cadillac Escalade EXT, 131,000 mi
AC/Heat both run but when I have either one set to run high, the outcome is very limited as though something is restricting it from exiting fully from the vents.