Radiator: Testing and Inspection

2AZ-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 2 steps, 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 is coming from the vacuum valve.

Pumping speed:

1 push every 3 seconds or more

NOTICE:

Push the pump at a constant speed.

(b) If air does not come from the vacuum valve, replace the radiator cap.

(c) Pump the tester, and then measure the relief valve opening pressure.

Pumping speed:

1 push within 1 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.

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)

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

HINT

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