Water Inlet and Thermostat Assembly Removal and Installation

Water Inlet and Thermostat Assembly: Removal and Installation

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.

Removal

1) Remove engine cooling fan (Motor driven type). Refer to [Engine Cooling Fan: Removal and Installation (Motor driven type)] Motor Driven Type.
2) Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
3) Remove water inlet and thermostat assembly.






CAUTION:
- Do not disassemble water inlet and thermostat assembly.
- Replace water inlet and thermostat assembly as a unit.

Inspection after Removal

1) Check valve seating condition at room temperature. It should seat tightly.
2) Check valve operation.





- Place a thread so that it is caught in the valve of the thermostat. Immerse fully in a container 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 lift amount.

NOTE:
The full-open lift amount standard temperature is the reference value.

- After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.
[Engine Coolant: System Inspection] [1][2]Cooling System [1][2]Cooling System [1][2]Cooling System





If out of the specification range, replace water inlet and thermostat assembly.

Installation

Installation is in the reverse order of removal.

CAUTION:

Do not spill engine coolant in engine room. Use shop cloth to absorb engine coolant.

Inspection after Installation

- Check for engine coolant leaks. Refer to Initial Inspection and Diagnostic Overview.
- Start and warm up engine. Visually check for engine coolant leaks. Repair as necessary.