Removal and Installation

THERMOSTAT

Removal and Installation


REMOVAL


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 radiator 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.
1.Drain engine coolant from radiator. Changing Engine Coolant.

CAUTION:
- Perform this step when engine is cold.
- Never spill engine coolant on drive belt.
2.Remove the air duct (inlet). Component.
3.Remove the radiator hose (lower) from the engine. Component.
4.Remove water inlet.
5.Remove thermostat.
6.Remove water pump, if necessary.
7.Remove thermostat housing, if necessary.

INSPECTION AFTER REMOVAL






- 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 full-open valve lift amount, lower the water temperature and check the valve closing temperature.
Standard: [1][2]Cooling System
- Replace thermostat if it is out of the specification range.

INSTALLATION

Installation is in the reverse order of removal.
- Use the following procedure to install the thermostat.





- Install thermostat making sure O-ring (1) groove fits securely to thermostat flange (A).

CAUTION:
Replace the O-ring with a new one.





- Install thermostat (1) into the thermostat housing (2) with jiggle valve (A) facing upward.
- Use the following procedure to install the thermostat housing.
- Securely insert the O-ring into the mating groove of thermostat housing and install it.

CAUTION:
- Replace the O-ring with a new one.
- Do not reuse O-ring.
- Install the thermostat housing to the cylinder block without displacing the gasket from the gasket position.