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Why is my heater and temp gauge acting wierd

(1999 Ford Explorer)
in Dry Ridge, KY on January 07, 2015
My heater will blow warm air then it will go cold and my temp gauge is also reading normal then it will drop to cold
Just replaced the thermostat
My top radiator hose is getting hot
It has fluid
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Popular Answer
on January 07, 2015
You may have a failing ECT sensor. (engine coolant temperature sensor) https://www.youtube.com/watch?v=PN8Q1Z_9EFo
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