Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Cadillac DeVille

Problem Description and Possible Solution

One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.

Problem Data
RepairPal Verified
Average mileage: 110,489 (5,400–260,000)
16 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
508 people reported this problem
Viewing 1 - 20 of 250 comments
how do i change this actuator motor . can i do it from under the dash or does the whole dash have to come off
cold air driver side vents /hot on passenger side vents
With AC on driver vents blow out hot air and passenger vents blow out cold air.
Clicking sound in dash when ac/heat system activated, air only comes from defrost vents.
cold air coming out of driver side vents and hot air coming out on passenger side when a/c switched on.
air from top vents dont flow and ticking in the dash.
When a/c is on, hot air blows from passenger side vents.
cold air on drivers side & hot on passenger??? HELP////
when start car this ticking sound starts for about 30 sec, i cannot get air or heat thru center dash vents all other vents work fine. sometimes air or heat will come thru center vents and then will cut off but will still come thru other vents.
when ac is on the pasenger side blow's hot air
a/c failed to work...had it checked & the gear on the actuator motor that sends the air from the floor to dash vents was partially stripped causing it not to cool off the car...actuator motor was fine but the gear was not the dash had to come out and the bill was around $800.00for a $1.00 plastic gear
Blower working in floor and back seat, but not from the dash. Dealer had to remove dashboard to get to actuator.
hot air in a/c mode
Heating and A/C temperature and air delivery mode door actuators may fail
Air conditioning blowing up through dash vents right at the windshield and not through the correct A/C vents. Replaced mode actuator which fixed the problem. The mechanic was able to do the replacement without taking out the dash. When I took it in they said, the dash would have to be removed to do the work. This saved me a good amount of money with the time savings. 5/7/2012
Driver's side AC is cold, passenger side is HOT. Yesterday it to shop, they added freon, drove it last night and hot air still blowing out passender side. This morning took it back to shop, apparently a small amount of freon had escaped, they refilled and added dye, I was told there may be a leak in compressor, to bring it back if same happened so they could check where dye indicated a leak. Now, from reading similar problems on forums, it sounds like acuator needs attention, not compressor.
rear area dlows hot air while a/c is on
When engaging the heater a fast clicking noise prevails for several seconds and then stops. Air will not come through the vents unless I turn the air on.
Air was only blowing out at the feet. Dealer repaired a/c mode door actuator for $450.00.