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My kenmore window unit AC started blowing a white smoke like substance. It seems to be cooling fine. What is this and is it a concern?

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The two things it could be, #1 - evaporator leaking refrigerant - unlikely if unit is still cooling o.k. because window units do not hold a lot of refrigerant and if there is a leak bad enough to blow smoke it would have stopped cooling by now. #2 - the humidity is high and the unit has cooled the air right at the discharge down below the dewpoint, a common occurence in window units and automobiles due to the short duct distance from the evaporator to the air outlet whereas with central air systems having longer duct systems the air gains more heat before being discharged into the room.

Posted on Aug 30, 2010

  • jarrett vachon Oct 01, 2013

    so is it bad to keep running it?

  • KERO87 Oct 01, 2013

    Nope. If it's cooling and there's no foul/burnt/unusual odor, it's perfectly fine.



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