Random air conditioning blows hot air

Discussion in 'Domestics' started by jigfeett, Sep 21, 2017.

  1. jigfeett

    jigfeett Full Member

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    Please fill out the following to ask a question.

    MAKE: Chevrolet
    MODEL: Trailblazer
    YEAR: 2002
    MILES: 165000
    ENGINE: 4.2
    DESCRIBE ISSUE....A/C random blows hot air.

    2002 chevrolet Trailblazer LTZ

    Electronic dual climate controls

    Random A/C issue, 98° ambient going along @ 70mph blowing cold air

    And for no reason blows hot air, blower speed & duct location did not change

    Stopped & checked the fuses and relays in engine comp & in passenger compartment

    Actually swapped each out with known good fuses and relays

    At this time compressor was not activating & accumulator was not iced over

    Continued on road trip & about 100 miles along A/C just started blowing cold air again.

    When I got home I checked the charge with my Robin air 34788NI and found it to be low.02 ounces, so I recovered and recharged to spec. I read Alldata and found there is a low pressure switch tsb issue

    Bought the AC Delco switch that is called out in the tsb for randon A/C issue switch did not fix the issue as several days later the A/C randomly blew hot air

    I understand there is a HVAC program update but I cannot check it and dealer said bring it in and for $130 they would check it service guy was a bit of a jerk so I will call dealer where car was bought

    I would think with the vin # any dealer could look it up?

    This car was bought from the original owner & she said if there were any updates and the dealer notified her, updates were done.

    I think this is one of those electrical gremlins

    Any thoughts or help is much appreciated.

    Thank you

    Rob
     
  2. kev2

    kev2 wrench

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    I found this - IDK
     

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  3. jigfeett

    jigfeett Full Member

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    Added info, the car did have a history code for
    U1152 loss of heating vent/air conditioning communication.
     
  4. jigfeett

    jigfeett Full Member

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    Thank you, yes I saw that and that was the irritating part when I called the dealer and all they wanted to do is charge $130 to tell if it is up to date. Do you know if a dealer can look it up or not?
    thanks
     
  5. kev2

    kev2 wrench

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    if it was done by an authorized GM dealer it should be in the vehicle service history.
    Any GM dealer can search vin # history.


    IF and SHOULD are no guarantee -

    GTG
     
  6. jigfeett

    jigfeett Full Member

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    Thank you.
     
  7. jigfeett

    jigfeett Full Member

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    Update so far 3 more dealers have said bring it in $130 to hook up. I think I am stuck with doing so just to be sure software is at correct level.
    I will update when I get this part done.
    Thanks
     

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