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Thread: STS 2001 passenger side air if fine but driver side air is not cooling

  1. #1
    john19999 is offline Cadillac Owners Fanatic
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    STS 2001 passenger side air if fine but driver side air is not cooling

    When I keep both driver and passenger side air at the lowest temperature 60 degrees, the passenger side cools well and duct temperature was about 48 F whereas outside temperature was 80 F. However, the driver side was warmer like 60 F at duct. Any idea what is the reason that driver side air is not working. I will appreciate any details.

    Thanks
    John


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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Either a blend door problem, or you're a little low on refrigerant. Have you pulled your codes yet?

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    john19999 is offline Cadillac Owners Fanatic
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    I have not checked codes yet. I have recently charged. Charging seems fine. The passenger side is quite cold. Not sure why driver side air is not cold. What is blend door? How can I check.

    Thanks
    John

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If you had to charge it, there's a leak. Did you use a gauge set to check the pressure, or the gauge on a can of refrigerant?

    The blend doors are what controls airflow through the heater core. They're monitored, and should set a code if not operating correctly.

    I assume you're familiar with the sticky on how to pull codes?

  6. #5
    Ranger's Avatar
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    Was it OK after you recently recharged it?

  7. #6
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    If you haven't researched the HVAC operation you need to do some homework. The entire system uses a host of temp sensors, blend/diverter doors, actuators, and switches to control all system operation.

    In your 2001, a temp setting of 60, both sides or singly with the PASS control OFF, will activate RECIRC (the icon will NOT be on) in order to rapidly cool the interior. If the driver's side vents (MODE setting ???) are not about the same temp as the passenger's, then you have a temp sensor problem in a duct, a blend door problem or a slightly undercharged R134a system - and that "slight" is something a good A/C tech will have to check.

    The different door actuators and the 4 duct temp sensors, the ambient outside temp sensor, the sun load sensors, as well as the cabin air sensor (aspirator) in the little grille left of the steering wheel are all monitored for B codes.

    www.alldatadiy.com for instant gratification if you don't have a real GM/Helm serviice manual.

  8. #7
    john19999 is offline Cadillac Owners Fanatic
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    The temp at ducts on driver side are usually 10 F higher than temp at passenger side. Passenger side is ice cold (temp 50 F or even 45F when outside temp is around lower like 73). However, when I pressed the RECIRCULATE button, the driver side ducts temperature dropped to the same lower temp as in passenger side. The question is what could be wrong that by pressing the RECIRCULATE, driver side becomes fine.

    I pulled out codes. It had only following HISTORY codes:

    1. DIM B1324
    2. DDM B3833
    3. DDM U 1715
    3. DDM U 1716

    I think the DIM B 1324 shows refrigerant over charged. In fact, I charged about 10 OZ recently using cheap Walmart single meter at low side. Low side pressure was in the yellow range (about 45 psi) when I completed charging. I know it was my mistake to over charge.

    Now AC with Recirculate button pressed is fine. However, I think the car will be foggy when I drive long distance or during rain. Any idea what to check. Thank you al!

    John

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    Ranger's Avatar
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    First thing you need to start with is the code definitions. Without them they are just numbers.

    45 psi on the low side is high. Should be closer to 35, but you also need the high side reading.

  10. #9
    basscatt's Avatar
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    Re: STS 2001 passenger side air if fine but driver side air is not cooling

    like Ranger said -
    your pressure readings are way off -

    B1324 - IS an AC OVERPRESSURE code -

    you can/will damage the system with an overcharge -
    if you continue to run it -

    at 80* ambient temperature -
    cabin temp set to 60*
    fan on medium speed -
    engine at a high idle - 1500 RPM -

    with a properly operating AC system -

    the LOW side pressure should be 30 to 35 PSI -
    the HIGH side pressure should be be 180 to 210 PSI -
    and the duct temp should be between 37 and 42* at the center duct -



    I recommend getting it looked at by someone knowledgeable in AC -
    and stay away from the DIY crap at wallyworld -
    ----------------

    oh - if changing the RECIRCULATE door position equalized the duct temps -
    your problem is most likely a MIX DOOR - or blend door problem -
    like MoistCabbage suggested - NOT a freon-related problem -
    Last edited by basscatt; 06-29-13 at 02:40 PM.


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