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Thread: Expansion tank replacement number two

  1. #1
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    Expansion tank replacement number two

    One of the first jobs I did on the 850 was to replace the OEM (white) coolant expansion tank. That was about 14 years ago. After the last drive, I opened the hood to connect the battery tender and heard an ominous hissing. The black tank was leaking steam from the place indicated in the photo (where the top is joined to the body).
    Just FYI.
    46258015754_7503b12dde_c.jpg

    Mark in mid-MO
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  2. #2
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    If you haven't already - change the cap - it contains a pressure-relief valve and may have failed....
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  3. #3
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    Thanks, Timm!

    Mark in mid-MO
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  4. #4
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    Quote Originally Posted by ByMW View Post
    One of the first jobs I did on the 850 was to replace the OEM (white) coolant expansion tank. That was about 14 years ago. After the last drive, I opened the hood to connect the battery tender and heard an ominous hissing. The black tank was leaking steam from the place indicated in the photo (where the top is joined to the body).
    Just FYI.
    46258015754_7503b12dde_c.jpg
    The black plastic in the cooling system components (radiator and reservoir) weakens with age, pressure and temperature.
    I would always suggest to prevent cooling system "on the road" failures that these components be replaced as part of a maintenance schedule and 14 years is much too long.
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