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Red oily looking substance in expansion tank

(1999 BMW 323is)
in Longview, TX on February 16, 2011
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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Popular Answer
on February 25, 2011
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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What would cause a reddish oily looking substance in my expansion tank along with coolant level being extremely high?
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