Service A/c and A/C compressor off

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
Northstar Engines and System Technical Discussion Discussion, Service A/c and A/C compressor off in Cadillac Engine Discussion; Help !!! I have a 97 , Replaced compressor , drier , orfice tube , all o-rings rechared 32 oz ...
  1. #1
    wrgr84 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2008

    Service A/c and A/C compressor off

    Help !!! I have a 97 , Replaced compressor , drier , orfice tube , all o-rings rechared 32 oz freon and compressor will not kick in . I can run wire direct abd it will but not threw system . I have 2 codes coming up on PCM , Service A/C and A/C compressor off . I have tried to reset the PCM , it will not reset.

    Connected Modis to it reset all codes did not change , same codes come up . Disconnected battery for 5 minutes did not work ,

    I keep hearing you have to reset the PCM , But everytime I try it will not reset .

    Any suggestions ????

  2. Remove Advertisements

  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Service A/c and A/C compressor off

    You do not have to "reset" the PCM, but you do have to clear the DTC's. Pulling battery power should have done it. Did you pull a vacuum when you recharged it? How did you recharge it without clearing the DTC's? Clearing the DTC's is what enables the compressor.

  4. #3
    Tommy Deville's Avatar
    Tommy Deville is offline Cadillac Owners Enthusiast
    Automobile(s): None
    Join Date
    Jan 2006
    Staten Island NY

    Re: Service A/c and A/C compressor off

    Somthing is locking it up, check all ur relays, fuses, switchs & connections, get a voltmeter, they are very cheap make sure you are getting power where it's needed.
    If every thing checks out ok than start over, vaccum it out, clear all the codes & refill with freon & oil.
    Good Luck.

    Oh one more thing, did you actually clear the AC codes?? Clearing the PCM doesn't clear the A/C codes you have to clear the ACM (AirCondioting Module) Now, if you pulled the BATTERY THAT SHOULD HAVE CLEARED THE CODES, b4 you do all of the above go back into the DIC & check.

  5. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts