Question about 1997 Cadillac DeVille

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1997 Cadilliac A/c Heater controller problem

Can anyone tell me the exact location of the A/C heater controller. I have another car with a good controller and want to put it into my car.
I have been told that my controller is bad and a new one costs $900.00 plus labor. The car will not heat nor does the A/C come on and the fan does not operate. Also the parking brake will not release, so I have to do this manually and they tell me that this is because the controller is bad. The brake gets its electrical power from the controller. I think I can do this job myself, but have no idea where the controller is located.

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  • Lesvallance Dec 03, 2008

    Can anyone tell my the exact location of the AC heater PROGRAMMER on my 1997 Cadilliam Deville. In my original posting I called the programmer a "controller". The garage down the street told me my PROGRAMMER is bad. The did several checks on blower motor and loose wires, etc.
    I have another 1997 Caddy with a good programmer and want to put that one into my car. I think I can do the job my self, I just have know idea where the programmer is located.

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First and fore most, i have advice and i can only hope it helps. I would go to a auto parts place and purchase a repair manual for that car. There about 20 to 30 dollars and will help you greatly.

Now, im guessing if your looking for the A/C and heating controler. I think, if its like most cars i have worked on, It may be in the blower moter compartment.

In most newer cars under and behind the glove box ( if applicable ) there is the houseing where the blower motor is houses, inside is the air controller that governs the fan speed and air temperature for the Cooling system, activates the compressor and opens and closes the inside/outside air flow.

Its usually right beside the ac blower motor rotary fins and faces it, there should be a wireing harness attached to it.

While you begin to remove the plastic underneaith the glove box, you may come accros the cars CCM or Computer Control Module. SOme repair manuals have different ackranims or terms for it.


It may be there in a plastic ractangular box with a wireing harnes as well and this controls the cars electrical functions. DONT OPEN IT or Tamper with it as they are expensive and without it, the car is a paper weight, a large one.

Many cars have differnet locations for the vehicles main controlers, Central processor or CCM or whatver term that the dealer has for it. Some are under the dahs by the steering column, some under the dash behind the glove box, some behind the stereo.

Again, i would recomend getting a repair manual for this. A repaire manual is not the same as the owner manual, its a full sixe paper back book with several sections and pictures.

You can also try E-bay, alot of people sell them for cheap.

Oh, and please, unhook the battery before doing any of this work as you could short the circuit board or deploy and airbag, both expensive and avoidable.

Good luck

Posted on Dec 03, 2008

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HELLO,
and sorry for all the bogus answers!!!!
your programmer is behind glovebox on the hvac box itself. remove the panel under dash and you should see it

Posted on Dec 03, 2008

  • TripleTauto
    TripleTauto Dec 03, 2008

    this is only pic i have

  • TripleTauto
    TripleTauto Dec 03, 2008

    you will need to remove glovebox as well job only pays .8tenths of an hour to do so it is not to bad of a job

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Hi i think its not a/c heater controller because it controlls only heating and cooling system.i think you are talking about engine itself.if you want the diagrams i can send you by mail..

Posted on Nov 30, 2008

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Test The Plug On The Blower Motor For Voltage If It Has Voltage Test The Blower Motor If Its OK. Most Likely Your Plug Is Bad Loose Or Broken Wire If So Replace It. 

also test this
Remove The Wire Pluged Into The Blower Motor, Test To See If You Are Getting Voltage. Also Check The Plug On The End Of The Wire You Removed. You Will Most Times Find A Bad Connection. Like A Wire Loose Or The Rubber Deterated. Buy This Plug If That Is What You Find. Get Some **** Connectors Install The New One. Be Sure To To Correctly Get The Colors Right. This Should Take Of It. 

Posted on Nov 30, 2008

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Basically that message is telling you it's time to service the automatic transaxle. To reset the message:Key "On" Engine "OFF". 
Press and hold OFF & REAR DEFOG buttons (between 5 & 20 seconds) on the Climate Control simultaneously until the Trans Fluid or Life Reset message appears. 

This transmission requires a transmission filter and fluid change. I would advise against a transmission flush since that can often do more harm than good.

Posted on Nov 30, 2008

  • futureloginn
    futureloginn Nov 30, 2008

    Does air come out of any of the vents, or is it just not coming out of the defroster vents? If there is no air coming from any of the vents then you have something blocking the air intake. I found that it is common to find paper napkins that fell out of the glove box blocking the blower motor.
    If it is just the defroster vents then you will need to take it to your Cadillac Dealer. He needs to connect his scanner to the HVAC system and pull the Diagnostic Trouble Codes (DTC's) for the HVAC system to pinpoint what's wrong.


  • futureloginn
    futureloginn Nov 30, 2008

    for more help download service manual from the above link  -----
    http://www.devicemanuals.com/guide/Autom...

    Thanks

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