The cooling fan is not working.
The most common problem is the cooling fan switch located on the pipe that connects the upper radiator hose to the radiator in the engine compartment. Another issue is that there may not be sufficient coolant in the radiator. I would make sure that the radiator is full of coolant and all the air is bled out of the hose going to the motor. If there is an air pocket in that pipe, the switch will not work correctly. I would recommend having a certified technician come out and check for air in the system and test the resistance of that fan switch.
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