GMC Yukon XL 2500 Problem Report
GMC Yukon XL 2500 Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator
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.
HVAC air flow restricted to defrost vents on top of dash, but AC flows to rear of vehicle via roof vents. However, when using heater, heat is only obtained through dash defrost vents and not the dash front, floor, or rear of the vehicle. - Visitor
A/C will not blow cold while at idle or low speed driving. highway driving is just okay. - Visitor
Driver's side A/C switches from cooling to full-on heat, but thermostat seems to work, because it increases fan speed to attempt to lower cabin temperature, by blowing blazing hot air! - Visitor
A rattling noise may develop from the AC belt tensioner. This can be caused by an internal faul...
WHARE DO I FIND THE SRCONDARY AIR INTAKE CHECK VALVE, IF CLOUGED DO I CLEAN OR REPLACE?
One or both secondary air injection check valves may become restricted causing poor air flow re...
The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our...
back a/c is not working correctly blowing vent air while a/c is on