Radiator: Testing and 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 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

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 (Procedure "B").
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 minimum, replace the radiator cap.

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