Hi sleepster69, Welcome to 2carpros and TY for the donation
Check the radiator if its partially clogged and water pump doing its job circulating coolant thruout the engine could be weak. If there's no boiling over maybe the coolant temperature is out of calibration or the new thermostat is acting up-one control s the temperature and the other reads the temperature.
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Friday, July 16th, 2010 AT 3:25 PM