Hi there,
You may have a very minor leak that only occurs when the engine is hot and under pressure, best have a coolant system pressure test done, this will normally show up any minor leaks, also have the radiator cap tested for release pressure. Check around all the hose fittings for any tell tale signs of coolant loss, many cooling systems additives will dry into a crystallized stain around minor leaks, start with the simple things first, hopefully this will show up a minor repair issue.
Mark (mhpautos)
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Tuesday, November 13th, 2007 AT 3:59 PM