If you stopped and told them to replace the t-stat, chances are that is all they would do. However, I have a few concerns. First, was the cooling system bled? If there is an air pocket, it will cause this to happen. Also, was the old coolant clean and did the radiator appear to be clear inside? Finally, and I know you don't want to hear this, but a bad head gasket can cause the same thing. Did you check for coolant mixing with the engine oil?
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Tuesday, April 6th, 2010 AT 10:12 PM