Radiator: Testing and Inspection

2AZ-FE COOLING: RADIATOR: ON-VEHICLE INSPECTION

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.
If air does not come from the vacuum valve, replace the radiator cap.
(b) 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)
If the opening pressure is less than the minimum, replace the radiator cap.
HINT: Use the tester's maximum reading as the opening pressure.