1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 287Get this manual
TECHNICAL FEATURES
COOLING SYSTEM
In addition to the oil cooler, control system is designed to improve engine performance in wide range from low through high speeds
The fan control system is composed of an oil temperature sensor, fan motor control unit, and oil temperature indicatorWhen oil temperature goes over 110-' 30C (270 -306F), sensed by the oil temperature sensor, the fan motor operates through the control unitWhen oil temperature goes over 170190C (378-414F), the oil temperature indicator comes on through the control unit and alerts that the oil temperature is rising critically high