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

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: 122,574 (46,000–257,000)
14 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
89 people reported this problem
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Viewing 1 - 20 of 49 problem details
No airflow out of the dashboard air vents. The rear seat vents work and cold air comes out. How do I repair the front vents to get the air flow?
air blows warm on drivers side @100 degrees and pass side @70 deg. Code left was B1343,(air inlet door movement fault). I haven't fixed it yet.I don't know where the door is.Please advise.
1999 Cadillac Seville STS 78,000 mi,
The Heating system works good on the drivers side but the passenger side dose not blow hot air.a/c works fine for both sides diver.passenger. It's just the heating problem how do I fix or what is the cause thank tom
1999 Cadillac Seville STS 76,000 mi,
one side blows cold another blows hot
1999 Cadillac Seville STS 133,000 mi,
Warm air flows on driver side cold air flows on passanger side. The air flow on floor on both sides is only cold. General airflow is restricted trough vents
Hot air from drivers side vents. Where is the actuator located?
Cold air only comes thru vents on passenger side while air on driver's side is warm or just regular vent air coming from outside of the car. Not fixed because i don't know what is the problem.
1994 Cadillac Seville STS 161,000 mi,
im not sure if this is the same or not i feel air from defroster but not the vents in in the dash my rear console blower doesnt come on but i can at times feel air blowing when car is in motion ,none of my blower motors come on except one time a week ago rear fan started to blow then it stoped any help where i should begin to look
2002 Cadillac Seville STS 136,000 mi,
Neither hot or cold air coming from any of my vents. Need help with this fast!
Cold only on drivers side, pass side feels like vent, no heat available anywhere in pass compartment....... all heat feels like vent
2002 Cadillac Seville STS 90,000 mi,
Air delivery and temp is ok but the air comes both from the windshield and the floor (both at the same time) I cannot get it to change to the dash port outlets.
1998 Cadillac Seville STS 147,000 mi,
hot on drivers side , cold on passenger side
Cold air on driver side and hot air on passenger side.
1998 Cadillac Seville STS 135,000 mi,
(HVAC) temperature and/or air delivery on passenger side blows out cold air all the time. Even if you shut odd passenger heat or AC control. The only way it is stopped is to shut off the main Climate control switch on the drivers side 1998 Cadillac Seville STS
No cold air comes out of the driver side vents
1998 Cadillac Seville STS 106,000 mi,
Driver side only brings in whatever air is coming in from the outside the right side passenger side does work heat or air conditioning
2001 Cadillac Seville STS 70,000 mi,
Air only blows from defroster and floor vents. Cannot change mode.
2002 Cadillac Seville STS 103,000 mi,
Heat works on 1 side of the car
1998 Cadillac Seville STS 130,000 mi,
Cold air always comes out under the glove compartment, even when the heat is on and the air comp. is off.