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Oil residue in coolant expansion tank – typical sources? 700

posted by  JohnB@MAC on  Sat Apr 10 10:44 CST 2004
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last visit: Sun Dec 9 10:15 CST 2007
[RELATED]

You can test for atf leak into coolant by introducing a flourescent dye into the atf. After a week or so shine a uv penlight or other uv light onto the coolant...if the oil slick glows, bingo.

Check to see the coolant glow before you add the dye just in case your coolant or the atf glows without the tracer. Also, this won't work if you've already put tracer in the engine oil (you may have slight leak with head gasket and we're testing for atf cooler leakage).

One quick check...pull your atf dipstick and make sure you don't have mousse/mayonnaise in the atf. If you have mousse on the dipstick...immediately deadline the car, replace the radiator, and flush the automatic transmission with about 15-20 quarts of petroleum atf (synthetic too expensive to risk it just yet). If the transmission lives another 5000 miles then you should flush with synthetic. I like to drain the atf pan every 20K and top up with new synthetic mainly because I'm too lazy to hook up the flush lines unless I have to!






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