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Thick White Smoke through exhaust after refilling AC refrigerant

Discussion in '2nd Gen 4Runners (1990-1995)' started by dpascual1986, Aug 15, 2016.

  1. Aug 15, 2016 at 11:12 PM

    dpascual1986 [OP] New Member

    Aug 15, 2016
    93 4runner v6 4x4
    I am getting thick white smoke when I fill the AC low port with refrigerant. When I drain it, the white smoke goes away. Anyone have any clues about what it is? I assume it is oil going into the intake through a vacuum line. Faulty vacuum switch for AC? Misplaced Vacuum lines?
  2. Aug 18, 2016 at 7:08 AM

    Kyle11863 King of the BS

    Jul 28, 2015
    First Name:
    Big Bear California
    1990 Toyota 4Runner SR5 V6 5 Speed Manual
    Doug Thorley long tube headers and lots of mud
    That is strange. Never heard of this issue before. Usually white exhaust smoke is an indicator for a blown head gasket but the fact it goes away after taking the freon out throws that idea out. From what I remember though there is no exchange between the a/c system in the engine though. Only contact they make is the fact they are bolted together and the belt that drives the a/c off the engine. No vacuum lines or anything. Not real sure what could be causing that

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