First, find the problem.
When the engine is running, whenever it reaches the temperature of the thermostat, that thermostat is supposed to open, allowing the hot coolant to flow to the radiator, to maintain proper engine temperature.
The thermostat could be stuck closed, needing replacement.
Whenever the engine gets warm, there is also an electric fan in front of the radiator, to cool the hot coolant in the radiator.
This fan works off a sensor that is ******* into the engine block (whose function is to read the engine temperature) and sends an electric signal to the electric fan to start when needed.
The sensor could be bad, the fan motor could be bad, and there is a relay in the system that could be bad also.
God bless your efforts.
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