Question about Cadillac DeVille

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Why wont the parking brake automatically release and the AC blows cold on the driver's side and hot on the passenger side of my 1999 Cadillac Deville?

Replaced two vacuum hoses that were dry rotted. The AC now blows into the cabin and out of defrost mode, but the parking brake will still not auto release.

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  • 194 Answers

Cable is old and rusted you need to oil it at the brakes end of it and work it back and forth till it frees up.

Posted on May 09, 2014

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Posted on Jan 02, 2017

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SOURCE: Problem with AC, dual climate zones

The temperature blend door on the driver's side might be broken or stuck. Also, if this vehicle does not have the correct amount of refrigerant, it will do what you are describing.

Posted on May 22, 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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My 1999 cadillac deville air conditioner blows cold on drivers side and hot on passenger side. heater works good on both sides.


Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Deville 1996 1999 Factory Service Workshop repair manual

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Bad tempture door actuator. This is on the drivers side of the ac box. Make sure your heater hoses are getting hot. You could have a air pocket in the system

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I have a 1999 Cadillac Deville Concorse. The climate controls are all on the dash below the radio. The drivers side works perfectly (both hot and cold), but the passenger side works intermittently. If I...


Could be that the hvac control module has an intermittent problem or the air mix door control for the passenger side is sticking. Check for error codes (DTCs) using a code scanner, but may not show an intermittent mechanical issue. If you can get at the air mix control on the hvac box under the dash on the passenger side, you may be able to check its operation.

May 23, 2017 | 1999 Cadillac DeVille

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The blend door for the passenger side is not connected right or functioning correctly. Try seeing if the dial on the armrest on the passenger side is not rotated one way or the other too much.

May 15, 2010 | 1998 Cadillac DeVille

1 Answer

A/c blows cold on passenger side and hot on drivers side


REPLACE THE AC CONTROL ASSMBLY AND BOTH BLEND DOOR ACTUATORS.

Jun 24, 2009 | 1999 Cadillac DeVille

2 Answers

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

1 Answer

Passenger side a/c blowing hot air, driver side is cold.


There's a rod assembly that opens and closes the vents in the car for the automatic climate control. It's supposed to open all vents to the AC feed when in AC mode. BUT, if it slips loose, the default status is to feed heat through (you can open a window in the summer, but you don't want AC blowing in your face and on your windshield in the winter). In my case, the driver's side was working right, pumping cold air, but the passenger side was actually dumping hot air into the car. Friend who fixed it for me told me he just had to drop the glove box etc. on the passenger side to get to the rod and slipped it back into place. I'm not agile enough, but if you are, you can probably crawl around under there and figure it out - or get a friendly mechanically inclined young friend to do it for you. Probably in the mechanic's manual for the Caddy (I don't have one).

Think this will fix it for you - did for me.

Jul 20, 2008 | 1999 Cadillac DeVille

3 Answers

Hot & cold


your frion is low or tempture controll unit can be bad

Jul 11, 2008 | 1999 Cadillac DeVille

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