Given the overheating history, I'd suggest two tests. The first is a compression check for a blown head gasket or possible cracked head. (Sorry to be the bearer of bad news, but your symptoms mirror possible head problems, and combined with recent overheating, is a likelihood). If you show low compression in one or adjacent cylinders, you'll need motor work. Sometimes a bad gasket won't give real clear signs through compression readings, so if compression tests good, pressurize cooling system to check for leaks. If you lose pressure with no visibile coolant leaks, it is leaking internally, most probably through the head gasket. Good luck
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Thursday, April 30th, 2009 AT 4:01 PM