Radiator: Testing and Inspection

1ZZ-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 procedure "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 (Procedure "A").
Pumping speed:
1 push every 3 seconds or more

NOTE: 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 (Procedure "B").
Pumping speed:
1 push within 1 second

NOTE: 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.

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

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