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The bypass hose allows coolant to recirculate within the engine,
without passing through the radiator, as it does when the engine is
warmed up and the thermostat opens. The bypass hose connects the
thermostat housing and the water pump. The water enters the bypass
tube through the bypass valve, when such a valve is fitted.
The bypass valve is sometimes operated thermostatically; it closes
off the bypass hose when a certain temperature is reached. This
increases the circulation of the coolant within the engine. Many cars
don't need a bypass valve, because there is plenty of coolant going
through the radiator hoses due to the thermostat.
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