Question about 1999 Cadillac Seville

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Driver side vents blow hot air passenger side cold on a 1999 cadillac seville

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

ASEtech
  • 67 Answers

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

  • 4 Answers

SOURCE: 1999 cadillac Deville cold air blowing out passenger side vents

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

  • 1 Answer

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.

Good luck

Posted on Jun 09, 2009

carfreak1217
  • 109 Answers

SOURCE: ac vents

One of the temperature actuators are not working it has 2, one for each side.

Posted on Jun 28, 2009

drguilford
  • 3 Answers

SOURCE: 1997 cadillac deville a/c problems

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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I believe that your Seville has dual climate controls.So it sounds like a "Blend Door Actuator" problem. It's stuck and so it's not adjusting the mix of warm or cold air; that's how temperatures are controlled in your A/C heat system. Fault code(s) stored in the HVAC control module should be available to assist with diagnoses. AutoZone will perform a free diagnostic scan.

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i've been down here too myself, and discovered that the temp control motor, located in the bottom of the glove box, which you can access by clearing all your stuff in in and opening a small door.
you can adjust it manually, and see if it changes, if yes, the switch can be defective, as well as the motor, the switch is the most likely problem.
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Phil
grandmotors.ca

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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.

Good luck

Jun 03, 2009 | 1999 Cadillac Seville

2 Answers

1999 cadillac Deville cold air blowing out passenger side vents


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

Jan 12, 2009 | 1999 Cadillac Seville

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