Component Inspection

COOLING SYSTEM (2TR-FE)

INSPECTION





1. INSPECT WATER PUMP ASSEMBLY
a. Visually check the air hole and water hole for coolant leakage.
If any leakage is found, replace the water pump.
b. Turn the pulley seat and check that the water pump bearing moves smoothly and does not make a noise.
If necessary, replace the water pump.





2. INSPECT FLUID COUPLING ASSEMBLY
a. Check the fluid coupling for damage and silicon oil leakage.
If necessary, replace the fluid coupling.





3. INSPECT THERMOSTAT

HINT: The valve opening temperature is inscribed on the thermostat.





a. Immerse the thermostat in water, then gradually heat the water.
b. Check the valve opening temperature of the thermostat.
Valve opening temperature: 80 to 84°C (176 to 183°F)
If the valve opening temperature is not as specified, replace the thermostat.





c. Check the valve lift.
Valve lift: 8.5 mm (0.355 inch) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.
d. Check that the valve is fully closed when the thermostat is at low temperatures (below 77°C (171°F)).
If not fully closed, replace the thermostat.





4. INSPECT RADIATOR CAP SUB-ASSEMBLY
a. Using a radiator cap tester, slowly pump and check that air comes from the vacuum valve.
Pumping speed: 1 push every 3 seconds or more

NOTICE: Push the pump at a constant speed.

If air does not come from the vacuum valve, replace the radiator cap.
b. Pump the tester and measure the relief valve opening pressure.
Standard opening pressure: 93 to 123 kPa (0.95 to 1.25 kgf/cm2, 13.5 to 17.8 psi)
Minimum opening pressure: 78 kPa (0.8 kgf/cm2, 11.4 psi)

NOTICE: The above pumping speed is for the first pumping only (in order to close the vacuum valve). After the first pumping, the pumping speed can be reduced.

HINT: Use the tester's maximum reading as the opening pressure.

If the opening pressure is less than the minimum, replace the radiator cap.