The cooling system includes: a downflow radiator, a thermoviscous belt-driven cooling fan, a toothed belt, a water pump, a thermostat, and an expansion tank. The expansion tank can be built into the radiator mountaineer or installed on the right side of the engine compartment.
The system functions as follows. Cold water from the water pump is pumped through the cylinder block and head, then through the bypass hose back to the side inlet of the water pump. Additional circulation occurs through the heater matrix. When the engine warms up to a certain temperature, the thermostat begins to open and coolant is directed to the radiator to provide additional cooling. The thermoviscous cooling fan is controlled by the air temperature behind the heatsink. When a certain temperature is reached, the internal valve opens and the hydraulic drive system turns the fan blades. As the temperature decreases, the drive decreases. The fan only runs when needed and, compared to direct drive fans, the result is improved fuel economy, reduced drive belt wear and reduced fan noise.
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