Question about 1999 Cadillac Seville
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Posted on Jan 02, 2017
SOURCE: Hot and Cold
The most likely cause of your problem is the blend doors under your dash. If they are not moving like they should it can cause this type of problem. You can look under the dash to see if there are any linkages that are disconnected. Some of these are very hard to change so you might want to take it to a repair shop unless you are very good with cars.
Posted on Dec 03, 2008
Sounds like a Blend door issue, but could be the controller switch, Test ALL modes of operation to see what works and what does not. That should narrow it down a bit. The Blend doors are flap/ doors that regulate air flow, newer vehicles are plastic - electric assemblies ...prone to failure. Any clicking or thumping noises during switching modes and on-off suggest a bad Blend door. Hope that helps...good luck
Posted on Jan 12, 2009
SOURCE: 99 STS AC is blowing hot air
I had the same problem but it was blowing hot air on the passenger side of the car. I assume you have the dual zone controls that I have as well. The problem is most likely the damper that controls the flow of hot and cold air into the car. The motorized component of the damper is most likely not working and its stuck in the hot air position.
I had mine replaced by a repair shop so I cant tell you how to replace it but it may be something that you can do if you have the time and patience to work on it.
Posted on Jun 09, 2009
Could be a vacuum line but have had this problem myself. The problem is most likely the "blend" air door behind the dash. This door operates via vacuum to slightly open or close allowing heated air from the heater core to mix with a/c air in the case of the passenger operating the individula comfort control button on the passenger arm rest. When the passenger wants their side a little warmer than the driver the door opens and warm air mixes in. The fix is not good. Several thousand dollars for dealer fix. The dash must be removed(and probably drivers door). My fix was to put a shut off valve on the heater hose going into the heater core so that I can shut off coolant to the core in summer temperatures. In winter I turn it back on for heater operation. Hope it helps.
Posted on Aug 07, 2009
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