Air Conditioner problem on my 1997 STS
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Air Conditioner problem on my 1997 STS in Past Cadillac Vehicle Discussion; The Automatic Climate Controls suddenly stopped blowing cold air. Advisory on dash showed low on Freon so had it re-filled ...
  1. #1
    scoobydo28 is offline Cadillac Owners Member
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    Air Conditioner problem on my 1997 STS

    The Automatic Climate Controls suddenly stopped blowing cold air. Advisory on dash showed low on Freon so had it re-filled at a local garage but the advisory panel still indicates the system is low on Freon and the compressor will not turn on. Mechanic bypassed the system and got the compressor to turn on and blow cold air so it's been confirmed that there is Freon and the compressor works. Must be some electronic problem in the automatic climate control function. Does anyone have any ideas? Thanks.

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  3. #2
    Subsailor613's Avatar
    Subsailor613 is offline Cadillac Owners Enthusiast
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    Cool Re: Air Conditioner problem on my 1997 STS

    There is a switch called: Low Pressure cutout switch, on Low Freon, it shuts OFF the
    compressor to protect the system from sucking in air, in case it loses ALL the freon thru
    a leak, so would let air in the leak point. On occasion, once this happens, the switch fails.
    P.S. there is also a High Pressure cutout switch, which cuts OFF the compressor on VERY
    High pressure to protect the other components from over pressure in the A/C system.
    Happy Motoring !

  4. #3
    scoobydo28 is offline Cadillac Owners Member
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    Re: Air Conditioner problem on my 1997 STS

    How do I reset the Low Pressure Switch?
    jaybee86 and jaybee86 like this.

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Was the code cleared after the system was filled? Was the leak repaired?

  6. #5
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    vincentm is offline Cadillac Owners Connoisseur
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    Re: Air Conditioner problem on my 1997 Seville

    Bypassed? The B1348 code fires and disables the compressor to prevent damage to it. clear the code.

  7. #6
    basscatt's Avatar
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    Re: Air Conditioner problem on my 1997 Seville

    start by checking for Diagnostic Trouble Codes -

    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -

    the problem COULD be low on freon -
    which means there is a leak -

    OR it COULD be a defective pressure switch -

    ----------------
    like the others have suggested -
    the codes MUST be cleared for the CC system to work -

  8. #7
    Subsailor613's Avatar
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    Re: Air Conditioner problem on my 1997 STS

    Pull off, Safely, "Leaving the connector Lock intact" and look between the two electrical connections,
    and there might be a button there. Press firmly, if there is one, you should feel a click.
    Dont know what your mechanic did, but he may have put a jumper between the two connections.
    Happy Motoring !

  9. #8
    basscatt's Avatar
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    Re: Air Conditioner problem on my 1997 STS

    Quote Originally Posted by scoobydo28 View Post
    How do I reset the Low Pressure Switch?
    -----------------------------
    just to clear things up a little -

    the low pressure switch is there to protect the compressor -
    NOT to prevent "air" from being sucked in -

    Freon carries the oil that lubricates the compressor -
    if the freon is low - the compressor might not get proper lube -
    the low pressure switch prevents the compressor from engaging -

    you don't/can't "reset" the switch -
    either there is - or isn't enough pressure to activate the switch -

    you MUST clear the stored DTC code - if there is one -
    after the pressure problem is resolved - before the compressor will run
    Tankboy40 and Tankboy40 like this.

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    Ranger's Avatar
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    Re: Air Conditioner problem on my 1997 Seville

    The low refrigerant code will disable the compressor to protect it. Actually the "mechanic" should have cleared the code BEFORE he serviced it to enable the compressor. That would have removed the need to bypass anything. Follow the above advice and clear the code.

    ----------

    Please do not double post.

    Threads merged.

  11. #10
    Subsailor613's Avatar
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    Cool Re: Air Conditioner problem on my 1997 STS

    [QUOTE=basscatt;3300475]-----------------------------
    just to clear things up a little -

    the low pressure switch is there to protect the compressor -
    NOT to prevent "air" from being sucked in -

    How does it protect the compressor ?
    Think: If the compressor continued to run it would run into a VACUUM,
    then sucking ambient air/with moisture thru the leak, into the system,letting the moisture
    contact the internals of the compressor and causing corrosion and failure of the compressor,
    Also losing some oil depending where the leak is located,further causing compressor failure l
    Some units are resettable manually, but the DTC code MUST be reset.

  12. #11
    MoistCabbage's Avatar
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    No. Damage can occur way before the system is completely empty. The refrigerant carries the compressor oil. If there's not sufficient refrigerant, the oil does not circulate.
    Tankboy40 and Tankboy40 like this.

  13. #12
    basscatt's Avatar
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    Re: Air Conditioner problem on my 1997 STS

    [QUOTE=Subsailor613;3302382]
    Quote Originally Posted by basscatt View Post
    -----------------------------
    just to clear things up a little -

    the low pressure switch is there to protect the compressor -
    NOT to prevent "air" from being sucked in -

    How does it protect the compressor ?
    Think: If the compressor continued to run it would run into a VACUUM,
    then sucking ambient air/with moisture thru the leak, into the system,letting the moisture
    contact the internals of the compressor and causing corrosion and failure of the compressor,
    Also losing some oil depending where the leak is located,further causing compressor failure l
    Some units are resettable manually, but the DTC code MUST be reset.
    ------------------------------
    How does it protect the compressor ?
    by preventing the compressor from running -

    If the compressor continued to run it would run into a VACUUM.............
    I was going to give you a correct - and long-winded answer -
    but decided against it - for a much shorter response -

    NONSENSE - and I'm being VERY NICE -

    Some units are resettable manually,
    MORE NONSENSE -

    I think you need to open a window -
    and clear the diesel fumes out of the room -

    I also think you need a refresher/remedial course in Automotive AC - 101 -

    don't have any idea where you got your "information" from -
    but you should find a new source -

    here is a REAL BASIC explanation of how the system works -
    a good place to BEGIN -
    http://www.autorepairinstructions.com/?p=51

  14. #13
    Subsailor613's Avatar
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    Re: Air Conditioner problem on my 1997 STS

    Thank you for sharing , what you consider a Knowledge base.
    If moisture was NOT an issue, why do we install filter/DRYERS ?
    My knowledge is NOT based on a web site, but classroom knowledge, and
    over 40 years in the trade, both, Automotive and Refrigeration/Air Conditioning.
    I am sorry you NEVER came across a Manual-Resettable Low Pressure Switch,
    OH Yeah, there is NONE on your desktop !
    "NONSENSE", i haven't heard that since 8th grade.
    I agree with your reasons, but,that is NOT the only reason.
    It seems you have evaded the original members Post,
    and chose to occupy this forum with member bashing .
    Have a Nice day.

  15. #14
    Aztec ETC ECS's Avatar
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    Re: Air Conditioner problem on my 1997 STS

    I think being a Submariner impersonator is a felony.
    basscatt and basscatt like this.

  16. #15
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    Re: Air Conditioner problem on my 1997 STS

    ......... or it may turn out that he is either a nuclear or forward Machinist's Mate, in which case he has various types of Freon and/or lithium bromide for blood. Those guys eat, sleep, and drink Heating and A/C 24/7/365.

    .......... and, yes, some cars have a manually resettable A/C compressor low pressure cutout (as opposed to our PCM sensor-operated electrical LP cutout). Given a freon leak and no compressor shut-down function it WILL draw a significant vacuum in the system - and if the leak is large enough, absent a LP shutdown function, as soon as the compressor (engine ??) stops running, the vacuum equalizes with atmospheric pressure - contaminating the system AND filter/dryer/receiver.

    Here's a pic of his boat - a THRESHER-class fast attack. West Coast boat. (The next design class after my first fast attack - USS SKIPJACK (SSN585))

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