I have a 1997 sts seville. When i drive for awhile i seem to be loosing coolant. If i drive for an hour it usually needs about a gallon of coolant. I cant find a leak or anything anywhere. Oil looks fine and i never find anything under car or in motor compartment.
coolant on 2005 Cadillac STS
by jack4556 in Williamsburg, OH on March 12, 2010
ANSWER by 427Chevy on March 12, 2010
You probably have a blown head gasket, check the oil to see if there is a tan to brown milky substance on it and if it does the head gasket will need to be replaced. you can get an estimate here www.repairpal.com/estimator and find a shop here www.repairpal.com/directory
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Engine Hot - AC Off