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Thread: Heater core fix question

  1. #1
    Join Date
    Aug 2005
    Location
    Toronto
    Posts
    1,720

    Default Heater core fix question

    I have the infamous foggy-windsheild-and-funny-coolant-smell when I turn the heat on.

    The windshield fogs up ONLY on the driver's side. The passenger's side is perfectly fine.

    I wonder if this tells me anything useful about where I should start looking for the problem?
    .


    Jay Lebo - Toronto, Canada
    1990 BMW 535i
    5-speed conversion
    Lightened flywheel
    Sachs Suspension Kit
    E.A.T. Chip

  2. #2
    Join Date
    Jan 2004
    Location
    Boston & Attleboro MA
    Posts
    727

    Default

    Where this problem usually comes from is the connections of the pipes to the heater core.

    Its a sucky job but not that bad.
    Current
    2008 M5 6 Spd
    2000 Z3 2.8 5 Spd MSport
    2012 X5 35d Sport
    1995 540i 6 Spd
    1992 535i 5 Spd

    Former
    1995 530iA
    1986 635CSI 5 Spd
    2011 X3 2.8 MSport

  3. #3
    Join Date
    Aug 2005
    Location
    Toronto
    Posts
    1,720

    Default

    Quote Originally Posted by DaCan23
    Where this problem usually comes from is the connections of the pipes to the heater core.

    Its a sucky job but not that bad.
    Right, well, I'm hoping that it is indeed one of the connections and not the core itself, and I was hoping that the driver's side only fogging was an indication of where I should start looking.

    I've read up on the replacement procedure and a buddy and I are prepared to tackle it when the weather improves, but in the meantime I was hoping to localize the problem a little more so that maybe I won't have to remove the whole dashboard.
    .


    Jay Lebo - Toronto, Canada
    1990 BMW 535i
    5-speed conversion
    Lightened flywheel
    Sachs Suspension Kit
    E.A.T. Chip

  4. #4
    Join Date
    Jan 2004
    Location
    Boston & Attleboro MA
    Posts
    727

    Default

    Well replacing the lines are just as much work, and it's usually because the plastic part on the core that accepts the connection has deteriorated. But unless $$$ is an issue, you'd sure hate to have to tear into it again if your fix didnt last or the core did go bad.
    Current
    2008 M5 6 Spd
    2000 Z3 2.8 5 Spd MSport
    2012 X5 35d Sport
    1995 540i 6 Spd
    1992 535i 5 Spd

    Former
    1995 530iA
    1986 635CSI 5 Spd
    2011 X3 2.8 MSport

  5. #5
    Join Date
    Aug 2005
    Location
    Toronto
    Posts
    1,720

    Default

    Quote Originally Posted by DaCan23
    Well replacing the lines are just as much work, and it's usually because the plastic part on the core that accepts the connection has deteriorated. But unless $$$ is an issue, you'd sure hate to have to tear into it again if your fix didnt last or the core did go bad.
    Well, my understanding is that the core is reasonably priced, so I guess I'll replace everything in there. Thanks.
    .


    Jay Lebo - Toronto, Canada
    1990 BMW 535i
    5-speed conversion
    Lightened flywheel
    Sachs Suspension Kit
    E.A.T. Chip

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