Radiator: Testing and Inspection

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

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 [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 reservoir cap.
(b) Pump the tester, then measure the relief valve opening pressure [B].
Pumping speed:
1 push every 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.
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.