Question about 1999 Cadillac DeVille

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Added freon - air conditioner won't come on

It blows hot air but no cold air

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  • Cadillac Master
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There are 2 pressure switches in the system 1 stops the ac compressor if there is not enough gas in the system and the other stops the compressor if there is too much gas . Next if there is a problem in the TX valve ( blocked orifice) then the head pressure will be too high and the compressor will not work. Next if you have not had the system checked for leaks ( why did you put more gas in ) then it has probably already been pumped out through the hole.. While you consider it a saving to do your own in the long run it is more expensive not to use an accredited auto air conditioner shop.

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

  • 119 Answers

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

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

  • 255 Answers

SOURCE: 1998 cadillac deville reads service ac system

Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1

Posted on Jan 04, 2009

  • 1 Answer

SOURCE: top rear vents blow out cold air[ 2005 cadillac srx ]

Hello according the the manual, the back vent are to blew cold air only..the fronts vents are suppose to the entire car...

Posted on Feb 24, 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

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It may still be low on freon. It can hold several cans.
High side should be around 250psi and low around 35 or 45psi at idle if system is charged.
If you raise engine speed the low can drop below 20psi and switch off the compressor if the system is low on freon.
Could be a restriction in the system, bad relay, or bad a/c compressor-clutch.

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