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1999 BMW 323is Question: red oily looking substance in expansion tank

 

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kristae, Longview, TX, February 16, 2011, 13:15
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I am leaving town and just checked my coolant to make sure I had pleanty. When I took off the cap, the coolant was all the way to the top and a reddish oily substance is floating on top. There was also some gunkie yellowish substance on the cap itself. A few weeks ago I had to have the tensioner pulley and V belts replaced. What is wrong?

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  • Answer #1

    Chow February 25, 2011, 09:52
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     Master

    The belts have nothing to do with it, possibly a leaking auto trans oil cooler and the red fluid if ATF. Good luck

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