Question about 1999 Cadillac DeVille

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1999 Cadillac Coup DeVille

My digital reader says low refridge ac off & i want to know how to reset it to get the ac to start working

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Have your a/c system charged and tested for leaks.

Posted on Jun 22, 2009

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1 Answer

How to program the ac


It sounds like you have either a low pressure cutoff switch that is faulty or connection at the switch/wiring. The computer will only see the fault while it is operating and it will only set the code after 2 consective faults. Make sure you have the system checked by a professional to make sure pressures are correct in the system first.

Sep 25, 2014 | 1999 Cadillac DeVille

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Replace shift modulator 1979 cadillac coup deville


The governor likely failed. Not a difficult part to find or replace.

Apr 14, 2014 | 1976 Cadillac Deville

1 Answer

Low-refrig ac off message is on


Does the AC system show normal pressure readings and maintains at least 28-32 PSI on the low side charging port?

Mar 21, 2014 | 1999 Cadillac DeVille

1 Answer

Hi! My 1999 Cadillac Deville for about 2 weeks started messaging low refrig-ac-off. Check engine light on!.


When you change your oil is up to you,you set the
months & miles you go. Any car with a reminder
for oil is just a gadget

You were told that your low on a/c refrigerant by the
message

Now the check light related or not has to be addressed,
by checking for codes & diagnosing the effected system

Your a/c system needs repair,not added to, only to leak out
& polute the atmosphere

Nov 14, 2012 | 1999 Cadillac DeVille

3 Answers

On the dashboard of my 99 deville it says a/c off low refrigerant. how do I turn the ac back on to recharge ? thank you ...


You will need to recharge it to get it to come back on, it has a pressure switch that will prevent operation until the level is brought back up to normal.

Jun 26, 2011 | 1999 Cadillac DeVille

1 Answer

My ac went out on my 98 cadi deville a few month ago. It just tells us low refridge. we tried to put some more in and the gage to fill it up says it is still full. but since then my econ/vent; heater; rear...


on those caddys you disconnect the battery and wait a few seconds and reconnect and it will reset ac system. when it goes into service mode the system just shuts down. the battery procedure is how to reset. when the ac compressor is not engaging you will not get an accurate reading on your gauges. it might be low but the compressor must be engaged for the system to take more freon.

Nov 18, 2010 | 1998 Cadillac DeVille

3 Answers

1998 Cadillac Deville low refrigerant a/c


I have a 1999 Cadillic Deville. The low Frefrigerant indicater come on after about 15 minutes of disconnecting the battery power. Each Time I reset the power the air conditioner comes back on for a while then goes out. I have taken it into the local auto repair place and they find no problem with the unit.
Could this be a intermittent connection to the computer. They have replaced both sencors and the problem persists. Where is the computer located on the car that handles this AC sensor message?

Jun 18, 2010 | 1998 Cadillac DeVille

1 Answer

I have a 1999 Cadillac Deville. It has the a/c codes and is full


one way that could work is to disconnect the battery for a few minutes. some models won't do it. the only other way is to take it to a shop that has a scan tool and have them clear it. did the person that told you the codes must be cleared, tell you what the codes were? it is possible to purchase and inexpensive code reader that is capable of clearing codes

Jun 04, 2010 | 1999 Cadillac DeVille

1 Answer

How do i put A/c coolant into a cadillac deville 1999. I dont have the owners manual and it needs some A/c fluid.


There is no such thing as an ac coolant, maybe the ac refrigerant you are refering to. The ac is not getting cold? You can buy a can of 134 that has its own charging hose and gauge. Find the low side line of the ac. Start the car first turn on your ac then connect the hose and charge it. It is very simple, now the gauge will show you how much you have in there already, and don't overcharge it.

Aug 12, 2009 | 1999 Cadillac DeVille

1 Answer

Ac not working


the sensor that detects low freon went bad and your compresor is not turning on try replacing that sendor

Jun 22, 2009 | 1999 Cadillac DeVille

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