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Message: <blockquote data-quote="affan66" data-source="post: 294728" data-attributes="member: 65">Open the oil cap and see if there is any grayish muddy residue on the cap. That indicates water is already in the engine.  Possibilities: cylinder head gasket out or worse, cylinder head cracked head.Another way to check is to see if the exhaust has bluish fumes. Same possibilities. Next to check is for hairline cracks on the radiator and coolant tank.  The coolant tank is the main culprit.  If you have not changed yours for more than 2 years, change it!!! When the car overheated, did you check the waterpump too? If not, change to the new version with a carbon fin. Don't use the plastic version.</blockquote>