Exploded View

1. Thermostat housing 2. Gasket
3. Rubber ring
4. Thermostat
5. Water inlet
6. Clamp
7. Radiator hose (upper)

A. To radiator

Engine front
: N·m (kg-m, ft-lb)
: Always replace after every
disassembly.

Removal and Installation

REMOVAL

1. Drain engine coolant from radiator. Refer to CO-11, "Draining".

CAUTION:

Perform this step when engine is cold.

2. Remove intake manifold. Refer to EM-28, "Exploded View".

3. Disconnect radiator hose (lower) (RH) from water inlet. Refer to CO-17, "Exploded View".

4. Remove water inlet and thermostat.

• Engine coolant leakage from cylinder block, so have a receptacle ready below.

Thermostat housing
1. Drain engine coolant. Refer to CO-11, "Draining".

2. Remove alterator. Refer to CHG-30, "MR16DDT : Exploded View".

3. Remove water pump. Refer to CO-22, "Exploded View".

4. Disconnect water hose, and them remove thermostat housing.

INSTALLATION

Note the following, and install in the reverse order of removal.

Thermostat

• Install thermostat with making rubber ring (1) groove fit to thermostat flange (A) with the whole circumference.

• Install thermostat (2) with jiggle valve (A) facing upwards.

1 : Thermostat housing

Thermostat housing
• Install in the reverse order of removal.

Inspection

INSPECTION AFTER REMOVAL

Thermostat
• Place a thread (A) so that it is caught in the valves of thermostat (1). Immerse fully in a container (B) filled with water. Heat while stirring.

• The valve opening temperature is the temperature at which the valve opens and falls from the thread.

• Continue heating. Check the full open valve lift amount.

• After checking the maximum valve lift amount, lower the water temperature and check the valve closing temperature.

Standard: Refer to CO-29, "Thermostat".

• If out of the standard, replace thermostat.

INSPECTION AFTER INSTALLATION

• Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) and the radiator cap tester (commercial service tool). Refer to CO-11, "Inspection".

• Start and warm up the engine. Check visually that there is no leakage of engine coolant.