•  The thermostat is built into the thermostat housing and cannot be serviced as a separate component.

•  The thermostat housing also acts as the engine coolant outlet connector and houses the ECT sensor. The ECT sensor is a push fit and is held in place by a retaining clip.

•  When the engine coolant temperature is below 88 °C {190 °F}, the thermostat is in the closed position. This restricts the flow of engine coolant through the upper radiator hose and allows the engine coolant from the engine to be circulated through the coolant bypass tube and the water pump back to the engine cylinder block, speeding up the warm up process.

•  When the engine coolant temperature reaches 88 °C {190 °F}, the thermostat begins to open, allowing engine coolant to flow through the upper radiator hose to the radiator. At the same time, the opposite end of the thermostat closes off the coolant bypass tube coolant flow. This forces the water pump to pull engine coolant from the radiator through the lower radiator hose.