Temperature control module (Freelander 2)

Pos.	Spare part number	Name
1	-	Thermostatic and bypass valve
2	-	Upper Radiator Hose Connection
3	-	Lower Radiator Hose Connection
4	-	Coolant manifold port to coolant pump housing
5	-	Engine Coolant Temperature (ECT) Sensor
6	-	Air outlet line connection
7	-	Supply to heater inlet

The temperature control module is mounted at the rear of the cylinder head and secured with two studs with nuts and two bolts and sealed with an O-ring. The module contains a wax-filled thermostat with a bypass valve and an ECT sensor. Two ports on the left side of the module provide the ability to connect the upper and lower radiator hoses.

The wax-filled thermostat is located in the upper radiator hose port. The large diameter port on the lower right side connects the module to the coolant manifold. Two small diameter outlet ports on the front of the module connect the supply hose to the heater core and the air outlet line to the expansion tank.

The thermal management module helps ensure that the engine quickly warms up to normal operating temperature by blocking the return of coolant from the engine to the radiator. During the engine warm-up phase, the thermostat is closed and the bypass valve is open. The bypass port allows coolant to circulate through the closed engine circuit - the coolant pump, the climate control system heater circuit and the EGR heat exchanger.



As the coolant temperature increases, the thermostat opens and the bypass valve closes. Hot coolant returning from the engine is allowed to flow from the temperature control module to the radiator through the open thermostat and the upper hose. Coolant returning from the radiator flows through the lower hose to the coolant pump - through the coolant manifold.

The thermostat begins to open at 83°C and closes completely at 91°C.

The full version is available on the website (LRman.ru)

The ECT sensor is located in the temperature control module. It is secured to the housing with a clamp. The ECT sensor provides an engine coolant temperature signal to the engine control module (ECM). The signal is used by the ECM to control the operation of the two cooling fans. For additional information, refer to: Electronic Engine Controls - 2.2L Diesel (303-14 Electronic Engine Controls - 2.2L Diesel, Description and Operation).

In addition, the ECM sends an ECT signal via the CAN bus to the Central Junction Box (CJB). The CJB sends the ECT signal via the medium speed CAN bus to the instrument cluster to provide an indication of the coolant temperature on the coolant temperature gauge. For more information, refer to the chapter: Instrument Cluster (413-01 Instrument Cluster, Description and Operation).