Question about 1996 Cadillac DeVille

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I have a 1996 Cadillac Sedan DeVille. This spring...

I have a 1996 Cadillac Sedan deville. This spring when I clicked on Auto versus Econ it switches directly back to econ. The air conditioning will not engage.

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If the a/c does not engage as a result of the electronic control system in your 1996 Cadillac, the climate control system may need to be replaced.

However, if the problem is being caused by low charge of R134a in the system, have the system charged before changing that electronic part.

I have never seen a Cadillac Climate Control System do this, which leads me to believe that it may be more electronic than refrigerant pressure related.

If the refrigerant pressure was low in the system, the climate control system should still stay on 'auto' mode, I think, and simply blow warm air.

Posted on Jul 03, 2010


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Posted on Jan 02, 2017


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Climate control 1996 cadillac deville

Unfortunately, it sounds like your HVAC control module is failing. You can try a reset by removing the negative battery lead (under the rear seat) for about 10 minutes, and then reconnecting it, but if that doesn't work, you will probably have to replace the module.

Oct 15, 2017 | 1996 Cadillac DeVille

1 Answer

My 96 Sedan DeVille Climate control system will not toggle between Econ and Auto Modes. It will only operate in the Econ Mode. The Auto Mode lights up when I push the button but immiediately switches...

This usually means the ac refridgerant is low. In Econ mode the ac compressor will not turn on, your car is staying in Econ to avoid damage to the compressor. If you are low on refrigerant it means you have a leak. Don't just buy a can and refil, have a professional shop check for leaks and fill the system with the proper oil and add refrigerant to the proper pressure.

Mar 07, 2011 | Cadillac DeVille Cars & Trucks

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Hello Bluebear.

When this happens on the Cadillacs of that year it is low or empty on refrigerant or the low pressure cycling switch has a problem.
The reason it happens is to prevent the compressor from coming on to protect it.
Without refrigerant in the system it can't get properly lubricated and will burn out.
I would recommend the system be checked by a professional.
You will just be wasting your money on kits at auto supply stores.
If you would like further advise on your Cadillac's AC, please ask me in comments.

Thank you for using FixYA.

Mar 07, 2011 | 1996 Cadillac DeVille

1 Answer

How do i turn on my climate control

Climate control is turned on by pressing the 'auto/econ' button.
There will be a temperature control for it that lights up on the right hand side of console display. One can also control the fan speed there or leave it on 'auto'

Sep 01, 2010 | 1989 Cadillac Sedan DeVille

1 Answer

When I push the air conditioner or the heat buttons, the screen shows econo instead of auto,do you know what's wrong? The car is a 96' cadillac deville,the problem just started, last year the air worked...

There is a problem with the air condition,econ,means the ac is not coming on,check to make sure the freon has not leaked out.If the freon is fine,see if the clutch is engaging on the compressor,if it is not ,then check the sensors on the liquid line ,along the firewall,they can go bad and the compressor will shut down,check all this and get back to me.

Apr 11, 2010 | 1996 Cadillac DeVille

1 Answer

My 1996 Sedan DeVille works on econ only with no heat or air. Will charging the a/c correct? Has never been charged. Only 36K on car

Alot of the time the cooling system will only work in Economy when your cooling system needs to be recharge. It does this to protect AC pump. Recharge and check for leaks. Should solve your problem.

Oct 14, 2009 | 2005 Cadillac Deville

1 Answer

1996 cadillac deville-auto switches to econ when turning on air

i have a 96 DeVille that did the same thing. It means your coolant tank is almost empty. It switches automaticlly to preserve based upon temp readings.

May 14, 2009 | 1996 Cadillac DeVille

1 Answer

Heat setting wont run on auto,its stuck in the economy mode

Whenever there is a measured loss of freon, compressor switch will blow and will remain on "ECON" till repaired and the computer is cleared

Mar 14, 2009 | 1996 Cadillac DeVille

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