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i think the fan is engaged at idle because that's where you will need the most air pulled thru the rad.
I thought a clutch fan has a thermostatic spring/coupler in the housing that engages the fan blades according to the temperature, so when it's hot regardless of engine speed or vehicle speed the fan would be pulling air.
I thought a clutch fan has a thermostatic spring/coupler in the housing that engages the fan blades according to the temperature, so when it's hot regardless of engine speed or vehicle speed the fan would be pulling air.