A/C and Stability system failure in my Deville 2003
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, A/C and Stability system failure in my Deville 2003 in Past Cadillac Vehicle Discussion; Hi Everyone. How are you? I have an experience in Cadillac Deville, but like these two problems I've never faced. ...
  1. #1
    RoOoGy is offline Cadillac Owners Member
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    Exclamation A/C and Stability system failure in my Deville 2003

    Hi Everyone. How are you?

    I have an experience in Cadillac Deville, but like these two problems I've never faced.

    I had an accident in my 2001 Deville and I bought an used 2003 Deville. the seller told me he have a ABS problem so he couldn't replace the EBCM, I took the EBCM in my old caddy and I installed it and everything was OK, except the message (service stability system) every time when the ignition is ON but in different condition. but sometimes i get the message (stability engaged) just a sec before i get service stability system message, and every system other than this is working e.g (ABS,TSC,..).

    the second problem is in the A/C: the A/C in my car is very cold but when my car goes in high RPM or high speed it goes hot, but don't think it's very high RPM or high speed e.g. (3500-4000 rpm and 100-120 km/h), and sometime when I'm driving normally.

    my problem in detail: when the A/C is working probably and cold, I hear clicking sound from the A/C compressor like turning On and Off once every minute or two minutes. and when I'm driving in straight and long way and set the cruise control to 100-110 km/h or less the A/C compressor switched off and start blowing hot (outside) air from vent.

    my opinion: maybe it's sort of sensor.

    note: The DTC in my car the current and the history:
    • C1287 - current (Steering Sensor Rate Malfunction )
    • C1288 - history ( Steering Sensor Circuit Malfunction )

    • P0420 - current ( Catalyst System Efficiency Below Threshold Bank 1)
    additional info about stability system problem:

    this is before the DTC shows:

    2013-06-28 21.36.14.jpg


    2013-06-28 21.36.22.jpg


    and this is after

    2013-06-28 21.33.44.jpg


    2013-06-28 21.34.13.jpg


    this is the A/C problem

    Before from (900-1700 kPa)


    2013-06-28 21.32.47.jpg


    after (490 and stable)

    2013-06-28 21.32.47 edit.jpg

    that's my problems and please help me!!

    regards, RoOoGy

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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: A/C and Stability system failure in my Deville 2003

    the AC compressor is supposed to shut off
    when you stomp your foot onto the gas -

    HOWEVER - the compressor should NOT cycle on and off -
    you are probably low on freon -

    connect a set of AC gauges -
    and report back with BOTH
    the HIGH pressure reading and LOW pressure reading -

  4. #3
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: A/C and Stability system failure in my Deville 2003

    Ok, I got your pm but your box was full.

    Let's attack the easiest code. The P0420.

    You can chase your tail with "myths" of oxygen sensor problems. That is not the case. Your vehicle, which ever one you're trying to fix with these codes needs a catalytic converter. I suggest a Walker Direct Fit. Nothing more, nothing less unless you like problems.

    Pertaining to the EBCM issues.... this is where the fun begins.

    Unfortunately, you have two different years you are trying to swap parts from. Yes while "physically" the cars maybe "identical" , parts wise there may be differences.

    The EBCM that you "swappped", did it come from a vehicle with the same "broadcast" code / numbers and lettering on the EBCM?

    Example. The one I replaced on my 00 stated:
    Model:09367420/09374749
    MLCG:25697696
    SERIAL:#00770797

    Then there were some large letters: HH

    I've seen JJ, GG etc in the field/ junkyard.

    You just can't swap any one on there because you don't know if they are calibrated the same. It is best to find a vehicle with the same codes to avoid issues.

    Your current code 1287, indicates there is an issue with the steering sensor, it's wiring or calibration.

    Yet , personally speaking I'd discredit that until you have a known working EBCM in the car with the SAME broadcast codes.


    Pertaining to your A/C, you're low on freon, or over filled. My opinion....low

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: A/C and Stability system failure in my Deville 2003

    The "C" codes are the reason for your stability message. Stabilitrac uses that sensor to do it's job.

    ----------

    Quote Originally Posted by basscatt View Post
    the AC compressor is supposed to shut off
    when you stomp your foot onto the gas -
    But he's not tromping on the gas. He said it happens in cruise. "when I'm driving in straight and long way and set the cruise control to 100-110 km/h or less the A/C compressor switched off and start blowing hot (outside) air from vent".

  6. #5
    basscatt's Avatar
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    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by Ranger View Post
    The "C" codes are the reason for your stability message. Stabilitrac uses that sensor to do it's job.

    ----------



    But he's not tromping on the gas. He said it happens in cruise. "when I'm driving in straight and long way and set the cruise control to 100-110 km/h or less the A/C compressor switched off and start blowing hot (outside) air from vent".
    ---------------------------------
    from the OP
    the second problem is in the A/C:
    the A/C in my car is very cold
    but when my car goes in high RPM or high speed it goes hot,

    THIS - I say is normal -
    high rpm or high speed - to me - means stomp on it -
    and the AC compressor is SUPPOSED to shut off -
    -------------------------------

    also from the OP -
    I hear clicking sound from the A/C compressor
    like turning On and Off once every minute or two minutes.
    and when I'm driving in straight and long way
    and set the cruise control to 100-110 km/h or less
    the A/C compressor switched off and start blowing hot (outside) air from vent.

    THIS is the compressor cycling - and I say is NOT normal -
    and probably caused be a low freon charge -

  7. #6
    thenaaks is offline Cadillac Owners Member
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    Could it be a blend door problem? Are you hearing the clicking nose from inside the car or outside? You should be able to see the ac compressor spinning if the clutch is engaged, and you should be able to see the clutch not rotating if it's disengaged.

    ----------

    Just noticed there was no code for blend door. There goes that theory...

  8. #7
    RoOoGy is offline Cadillac Owners Member
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    Smile Re: A/C and Stability system failure in my Deville 2003

    thanks for the replies

    for my A/C I'll check it and put more Freon and i'll back with a result


    and for the stability system:
    Ok, I got your pm but your box was full.

    Let's attack the easiest code. The P0420.

    You can chase your tail with "myths" of oxygen sensor problems. That is not the case. Your vehicle, which ever one you're trying to fix with these codes needs a catalytic converter. I suggest a Walker Direct Fit. Nothing more, nothing less unless you like problems.

    Pertaining to the EBCM issues.... this is where the fun begins.

    Unfortunately, you have two different years you are trying to swap parts from. Yes while "physically" the cars maybe "identical" , parts wise there may be differences.

    The EBCM that you "swappped", did it come from a vehicle with the same "broadcast" code / numbers and lettering on the EBCM?

    Example. The one I replaced on my 00 stated:
    Model:09367420/09374749
    MLCG:25697696
    SERIAL:#00770797

    Then there were some large letters: HH

    I've seen JJ, GG etc in the field/ junkyard.

    You just can't swap any one on there because you don't know if they are calibrated the same. It is best to find a vehicle with the same codes to avoid issues.

    Your current code 1287, indicates there is an issue with the steering sensor, it's wiring or calibration.

    Yet , personally speaking I'd discredit that until you have a known working EBCM in the car with the SAME broadcast codes.


    Pertaining to your A/C, you're low on freon, or over filled. My opinion....low

    you are 100% right and I checked the EBCM and it was the same.

    I think these 2 DTC C1287 & C1288 are very linked to the problem but I'm not very sure about it. (like what Ranger said)

    I don't know if I should buy a new Steering Wheel Positioning Sensor or not, and is it easy to repair? or should I get it repaired at the dealer?

    thanks again for your replies.

  9. #8
    13ir14314's Avatar
    13ir14314 is offline Cadillac Owners Fanatic
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    Cycling of the compressor is normal but his may be short cycling caused by low freon.
    I believe I read in the service manual the the clutch disengages at 80% throttle.

  10. #9
    RoOoGy is offline Cadillac Owners Member
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    Thread Starter

    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by 13ir14314 View Post
    Cycling of the compressor is normal but his may be short cycling caused by low freon.
    I believe I read in the service manual the the clutch disengages at 80% throttle.
    Thanks for the info.


    please answer these questions

    I don't know if I should buy a new Steering Wheel Positioning Sensor or not, and is it easy to repair? or should I get it repaired at the dealer?
    Thanks

  11. #10
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by 13ir14314 View Post
    Cycling of the compressor is normal but his may be short cycling caused by low freon.
    I believe I read in the service manual the the clutch disengages at 80% throttle.
    -----------------------------
    Cycling of the compressor is normal
    WRONG - compressor cycling is NOT normal in our Cadillacs -
    our AC compressors are a variable displacement design -

    the piston displacement changes to vary the pressure -
    rather than cycle the compressor to vary the pressure -

    ----------

    for my A/C I'll check it and put more Freon and i'll back with a result
    that is NOT what was suggested -
    you need to connect a set of AC gauges -
    to get the actual PRESSURE READINGS -
    for BOTH the HIGH and LOW pressure sides of the system -

    THEN it can be determined what needs to be done -

    ----------

    I don't know if I should buy a new Steering Wheel Positioning Sensor or not,
    and is it easy to repair? or should I get it repaired at the dealer?

    it is located at the base of the steering column -
    NOT a fun job -

    the problem MIGHT be a bad sensor -
    or it MIGHT just be a bad connection -

  12. #11
    RoOoGy is offline Cadillac Owners Member
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    Re: A/C and Stability system failure in my Deville 2003

    Hi guys.

    About the A/C problem:

    it's like what you say it was low in Freon because when I went to the A/C specialist he vacuumed the Freon and it was 330gm and the recommended in the car is 1Kg ( 2.2lb ) .

    Thanks for your help.

    About the steering wheel sensor problem :

    I order it from Rockauto.com because its very expensive in the dealer, maybe I'll get the shipment in 5 days and after I install it I'll give you the feedback.

    Thanks again.

  13. #12
    stoveguyy is offline Cadillac Owners Connoisseur
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    Yes! Finally someone goes to an a/c shop and Evacs system to really find out how much is there.
    Ashtrayhead likes this.

  14. #13
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by stoveguyy View Post
    Yes! Finally someone goes to an a/c shop and Evacs system to really find out how much is there.
    ------------------------------
    ya - but notice he verified it was low -
    but doesn't mention anything about checking for - or fixing the leak -

    oh well -

  15. #14
    RoOoGy is offline Cadillac Owners Member
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    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by basscatt View Post
    ------------------------------
    ya - but notice he verified it was low -
    but doesn't mention anything about checking for - or fixing the leak -

    oh well -
    I checked for leakage and there is no leaking or any problem just low Freon from the first owner of the car.

    thanks.

  16. #15
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: A/C and Stability system failure in my Deville 2003

    Quote Originally Posted by RoOoGy View Post
    I checked for leakage and there is no leaking or any problem just low Freon from the first owner of the car.

    thanks.
    -------------------------
    there is no leaking or any problem just low Freon

    the AC system is a sealed system -
    and should NEVER require additional freon -

    IF your system was low - there IS a leak - somewhere -

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