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2014 chevy cruze

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    2014 chevy cruze

    complaint of a mist / fog from a/c vent 20 minutes out on a drive . compressor dose not cycle off cooling fan cycles on / off fine . high side pressure reaches 270 on scan tool . could the a/c pressure switch be stuck in this position thanks
    I did replace cabin filter and same issue
    Last edited by rodargie; 3 weeks ago.

    #2
    Just a thought... you might check the cabin air filter. You'll probably need to remove the glove box to get to it. I'm finding a lot of dirty cabin filters lately.

    This fog can occur when the evaporator temperature is too cold. A restricted cabin filter would reduce the heat load on the core enough to simulate a low blower condition.
    Last edited by CJB; 3 weeks ago.

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      #3
      Also check for clogged evaporator drain. cool air acting in high humidity air causes fog. Where is the moisture coming from? Moisture get wrung from the outside air by cooling it down, it must be allowed to drain from the outlet of the evaporator,
      If the evaporator is getting too cool it will ice over with a reduction in air flow as it starts, and can completely cut air flow if it cools well below the frost point.
      What are vent temps when this is happening?

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      • CJB
        CJB commented
        Editing a comment
        Good point on the condensate drain!

      #4
      Originally posted by rodargie View Post
      complaint of a mist / fog from a/c vent 20 minutes out on a drive . compressor dose not cycle off cooling fan cycles on / off fine . high side pressure reaches 270 on scan tool . could the a/c pressure switch be stuck in this position thanks
      I did replace cabin filter and same issue
      vent temp when fog occurs 50* 54* the compressor dose not cycle on and off but the cooling fan will

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        #5
        clearing the drain tube seems to fix the mist thank you but is this system compressor designed not cycle ?

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          #6
          GREAT. Most if really plugged will also make interior floor wet when shut down or plain drip there. If blocked and full of water when clear usually a whoosh a water comes out. That proves problem is solved for now,
          Tom
          MetroWest, Boston

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            #7
            Originally posted by rodargie View Post
            clearing the drain tube seems to fix the mist thank you but is this system compressor designed not cycle ?
            Looks like this one uses a pulse width modulated ground to a variable displacement solenoid to control the compressor displacement.

            P.S. Thanks for posting an update and fix on your mist problem!

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