Dear George,
I'll start with the most common cause.
Check the radiator cooling fan to see if it is functioning correctly.
It is turned on by a sensor that screws into the engine block, and there is also a relay in the under-hood electrical box.
Finally, the electric fan is mounted at the radiator.
There should be 2 fans there, one of them is for engine cooling, one for Air Conditioner cooling.
The engine cooling fan should come on anytime the engine temperature exceeds the setting of the screw-in-the-block sensor.
If it does not, it could be the sensor, the relay, or the cooling fan itself that has failed.
If you live in an area of the country that is prone to extreme cold temperature, "road salt" can contribute to fan failure.
If all these check OK, write us back and tell us, we'll go to step # 2.
God bless your efforts.
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