The pcm sends a pwm signal to a solenoid valve on the fan motor giving it a variable rate.
Hydraulic radiator cooling fan motor.
The stock jeep 5 7l hydraulic fan is driven off of the power steering pump and requires special fluid.
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Caltric radiator cooling fan motor for polaris ranger 800 rzr s 800 efi 760cc 2009 2012 utv.
The hydraulic cooling fan runs at 500 rpm as soon as the engine is on as soon as the engine temperature rises above a certain level the pcm will command the hydraulic fan solenoid valve more open to ramp up the fan speed.
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The radiator fan is a key part of your cooling system.
Think of the radiator s fins and looped coils as a heat exchanger that emanates heat from the engine and the fan helps enhance that process especially when the vehicle is stopped and there s no air flow from movement.
This large tip clearance reduces the efficiency of the cooling air flow across the radiator by as much as 10 15 compared to a hydraulic fan drive system where the fan motor fan and radiator are attached to each other.