To ensure the proper functioning of the F-150’s cooling or radiator fan, the Fan Relay sends a signal to turn on the cooling or radiator fan. The location of the radiator fan relay can vary for each generation of the Ford F-150, as it is positioned in different places throughout the vehicle. A malfunction of the radiator fan relay can result in the fan not working properly. If the fan relay is stuck in the high condition, the Ford F-150 radiator fan will stay on continuously; otherwise, the radiator fan may not turn on at all.

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