The thermostat is numbered with the valve opening temperature.


(a) Immerse the thermostat in water and gradually heat the water.

(b) Check the valve opening temperature. Valve opening temperature:


If the valve opening temperature is not as specified, replace the thermostat.


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(c) Check the valve lift.

Valve lift: 10 mm (0.39 in.) 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 closed, replace the thermostat. 2. RADIATOR CAP SUB-ASSY NOTICE:

• If the radiator cap has contaminations, always rinse it with water.

• Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.

• When performing step (a) and (b) below, keep the tester at an angle of over 30° above the horizontal.

(a) Using a radiator cap tester, slowly pump the tester and check that air is coming from the vacuum valve. Pump speed: 1 push / 3 seconds or more


Push the pump at a constant speed.

If air is not coming from the vacuum valve, replace the radiator cap.

(b) Pump the tester and measure the relief valve opening pressure.

Pump speed: 1 push within 1 second NOTICE:

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

Standard opening pressure:

74 to 103 kPa (0.75 to 1.05 kgf/cm2, 10.7 to 14.9 psi) Minimum opening pressure: 59 kPa (0.6 kgf/cm2, 8.5 psi)


Use the tester's maximum reading as the opening pressure. If the opening pressure is less than minimum, replace the radiator cap.

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