Discovery II (LT) V8-4.0L (2002)
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Thermostat: Description and Operation
Thermostat Housing
A 'four way' thermostat housing, located at the bottom of the fan cowling behind the radiator, is used to link the main components within the engine
cooling system. The four connections locate the radiator bottom hose, top hose, by-pass hose and coolant pump feed hose.
The plastic housing contains a wax element thermostat. The thermostat and housing are a sealed unit and cannot be replaced individually. The thermostat
is used to maintain the coolant at the optimum temperature for efficient combustion and to aid engine warm-up.
The thermostat is closed at temperatures below approximately 80°C (176°F). When the coolant temperature reaches between 80 to 84°C (176 to 183°F)
the thermostat starts to open and is fully open at approximately 96°C (204°F). In this condition the full flow of coolant is directed through the radiator.
