Welcome to 2CarPros.
If the belt is on and tight, you should see movement when the thermostat opens. If there is nothing, are you sure there isn't an air pocket restricting coolant flow? Also, is the belt properly installed? Is the inside of the radiator clean? Was the thermostat by accident put in upside down? Also, check the lower radiator hose and make sure it isn't collapsed or kinked.
Let me know,
Joe
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Wednesday, May 15th, 2019 AT 8:31 PM