With no other details or observations to go on, have the cooling system chemical-checked for a leaking cylinder head gasket. Your mechanic can do that in less than two minutes.
Feb 12, 2014 at 2:12 PM
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Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.