Hydraulic oil cooler fan control
Hydraulic oil cooler use independent pump and motor for fan driving.
Fan speed has two steps (low and high) according to the temperature of hydraulic oil. If temperature goes
up to 70 degree, V-ECU turns on solenoid then fan motor speed become high. If temperature goes down
to 50 degree, V-ECU turns off solenoid then fan motor speed become low.
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