There are two motors which drive two seperate fans on the CR-V radiator. One is the regular cooling system fan and it is operated by a temperature sensing switch in the coolant system that monitors the coolant temperature. When the coolant reeaches a certain temperature the temperature sensing switch turns on the current to the cooling fan. When the coolant temoperature falls below a certain temperature the switch shuts the fan off. The other fan is the fan that is controlled by the vehicle cabin air conditioner. When the A/C is turned on the fan comes on automatically with the a/c.