99 STS A/C not cooling Please advise...
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS A/C not cooling Please advise... in Past Cadillac Vehicle Discussion; I have a 1999 STS. It is now beginning to get warm and my A/C does not put out cold ...
  1. #1
    tenaculum is offline Cadillac Owners Member
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    99 STS A/C not cooling Please advise...

    I have a 1999 STS. It is now beginning to get warm and my A/C does not put out cold air. Heat works fine. DIC states service A/C
    DIC Codes:

    B1343 Air Inlet door movement fault
    P0533 Air Refrigerant Pressure sensor circuit high voltage
    B1324 AC refrigerant over pressure

    Any Ideas??

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 STS A/C not cooling Please advise...

    Looks like you have a temp bad actuator.

    P0533 might be a bad sensor causing B1324.

  4. #3
    basscatt's Avatar
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    Re: 99 STS A/C not cooling Please advise...

    Quote Originally Posted by tenaculum View Post
    I have a 1999 STS. It is now beginning to get warm and my A/C does not put out cold air. Heat works fine. DIC states service A/C
    DIC Codes:

    B1343 Air Inlet door movement fault
    P0533 Air Refrigerant Pressure sensor circuit high voltage
    B1324 AC refrigerant over pressure

    Any Ideas??
    -------------------------
    B1343 Air Inlet door movement fault
    that is the "recirculating" door - it allows or restricts outside air into the cabin -
    it could be stuck - or the actuator could be broken -

    the recirculating door is fully closed at both the 60* and 90* settings -
    try running the temperature from 60 to 90 SLOWLY several times -
    it might free up the door - or "recalculate" the settings of the actuator -

    B1324 AC refrigerant over pressure
    either someone added freon to the system without gauges -
    or the pressure sensor is defective -

    connect a set of AC gauges -
    and report BOTH the HIGH side pressure reading -
    and the LOW side pressure reading -
    with the AC turned OFF - the STATIC pressure reading -
    and with the AC ON - if it runs -

  5. #4
    tenaculum is offline Cadillac Owners Member
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    Re: 99 STS A/C not cooling Please advise...

    Thanks for the responses. I have never added freon to this car and the a/c has worked fine for 3 years. I am thinking it's probably the sensor. Do you know which one or where it is located? I tried your suggestion basscat and don't know if it freed up the door. Is it somewhere under the dash where I can access it?

    Thanks ranger for your response as well. Any thoughts on which sensor?

  6. #5
    Ranger's Avatar
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    Re: 99 STS A/C not cooling Please advise...


  7. #6
    tenaculum is offline Cadillac Owners Member
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    Re: 99 STS A/C not cooling Please advise...

    Thanks for the Diagram Ranger. I will try to replace that sensor. Is this tubing under pressure? Do I have to drain the freon first?

  8. #7
    Ranger's Avatar
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    Re: 99 STS A/C not cooling Please advise...

    Not positive, but I believe you may have to evacuate the system to replace it.
    Tankboy40 and Tankboy40 like this.

  9. #8
    Gonjafishing is offline Cadillac Owners Member
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    I would empty that ac system before even touching it freon is some nasty sht you dont want that all over you or your car

  10. #9
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    Re: 99 STS A/C not cooling Please advise...

    Huh?

  11. #10
    basscatt's Avatar
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    Re: 99 STS A/C not cooling Please advise...

    Quote Originally Posted by Gonjafishing View Post
    I would empty that ac system before even touching it freon is some nasty sht you dont want that all over you or your car
    -----------------------
    I would empty that ac system before even touching it
    and HOW would you recommend doing that?
    venting freon to the atmosphere is ILLEGAL -

    freon is some nasty sht you dont want that all over you or your car
    REALLY?
    freon - at atmospheric pressure is a gas - under pressure it is a liquid -

    I believe #30 is the check valve - schrader valve -
    and you should be able to replace the pressure sensor
    without evacuating the system -

  12. #11
    tenaculum is offline Cadillac Owners Member
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    Re: 99 STS A/C not cooling Please advise...

    That's good to hear Basscat. Thank all of you for your posts. Really helps. I will proceed with the sensor exchange.

  13. #12
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    Re: 99 STS A/C not cooling Please advise...

    Guys, can we stop and think about this for a second?

    If #29 is a PRESSURE sensor, wouldn't it stand to reason that it is measuring the pressure in the a/c lines?

    If we continue under that assumption, wouldnt freon escape thru that opening when the sensor is removed?

  14. #13
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Read the last part of post #10.

  15. #14
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    Re: 99 STS A/C not cooling Please advise...

    Quote Originally Posted by Tankboy40 View Post
    Guys, can we stop and think about this for a second?

    If #29 is a PRESSURE sensor, wouldn't it stand to reason that it is measuring the pressure in the a/c lines?

    If we continue under that assumption, wouldnt freon escape thru that opening when the sensor is removed?
    That's what I always thought, but was once corrected. I've never replaced it so I can't speak from experience.

  16. #15
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    Re: 99 STS A/C not cooling Please advise...

    [/COLOR]
    Quote Originally Posted by MoistCabbage View Post
    Read the last part of post #10.
    If #30 is in fact a schrader valve, how would the sensor itself measure pressure???

    I read the last part of #10, and still think that freon will come blasting its way out of the open hole that the sensor screws into.

    I'm not pretending to know it all. I''m sharing my thoughts/questions.

    Hence all of the "?" marks at the end of my sentences in post #12

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