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?
red oily looking substance in expansion tank on 1999 BMW 323is
by kristae in Longview, TX on February 16, 2011
ANSWER by Chow 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
What would cause a reddish oily looking substance in my expansion tank along with coolant level being extremely high?