One other thing you should check, if you haven't done so already. The coolant level. BTW, the thermostat opens against the flow from the block not away from it. Make sure you have adequate circulation thru the radiator.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.