TM 5-3805-294-23-1
0003
COOLING SYSTEM - Continued
Fan
The variable speed fan is located at the front of the engine and is driven by a hydraulic motor. The speed of the fan
is varied to provide the amount of airflow that the engine coolant, charged air cooler or hydraulic cooler need, ensuring
maximum fuel efficiency, reduced noise levels, and faster engine warm-up.
The fan speed solenoid valve regulates oil flow and pressure buildup in the fan drive system. The more oil flow to
the fan drive motor, the greater the fan speed. How much oil flow is routed to the fan drive motor depends on the
current applied to the fan speed solenoid valve from the engine control unit (ECU).
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