Hello
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It sounds as if your thermostat is sticking periodically, blocking coolant flow and causing overheating. Once it finally opens, it cools the engine back down. Sometimes it may not stick at all, letting the engine cool normally. The thermostat is located on the intake manifold or water pump, underneath water outlet. Remove and test it in boiling water over stove. Inspect it to ensure it is opending at the proper temperature with a meter that can withstand hot temperatures. Thermostat should open around 190 F or whatever temperature is printed on the thermostat.
Post results and I will follow up.
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Friday, January 23rd, 2009 AT 1:33 AM