THERE IS OIL IN MY COOLANT RESERVOIR TANK

1999 Cadillac Catera

Tiny

matthewa9

October, 28, 2011 AT 11:21 PM

I went to check my fluids and discovered oil in my overflow tank. Ive been told that it the oil line in the cooling system broke. There is no moisture on the dipstick or in the crank case.

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2 Answers

Tiny

factoryjack

October, 31, 2011 AT 3:49 PM

If it is brown oil, it could be most likely coming from the oil cooler in the center of the engine valley. If it is reddish(could be brown also, depending on the condition), it could be coming from the transmission oil cooler that is in the radiator. The pressures in the coolers are typically more than cooling system pressure, and that could explain leaking in one direction, and not the other.

Tiny

cadieman

November, 1, 2011 AT 1:27 AM

Youll need to replace the radiator.

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