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The fan control module (FCM) as its is known industrially is can function as a relay or switch regulating the cooling fan operation. In some vehicles the FCM is relay between the engine control module (ECM) which turns on the fans as needed for cooling and when the air conditioning running. In other applications the FCM directly controls the cooling fans of the radiator based on temperature sensor readings. An FCM is critical component to keeping a vehicle from dangerous overheating breakdowns.
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