On-Vehicle Inspection

1GR-FE COOLING: RADIATOR: ON-VEHICLE INSPECTION

1. INSPECT RADIATOR CAP SUB-ASSEMBLY

NOTICE:
* If the radiator cap is contaminated, rinse it with water.
* Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.
* When performing the following steps (a) and (b), keep the tester at an angle of 30° or more above the horizontal.

(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, then measure the relief valve opening pressure.

Pumping speed:

1 push every second

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.

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)

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