Radiator Cap: Testing and Inspection

1. REMOVE RADIATOR CAP

CAUTION: To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator are still hot, as fluid and steam can be blown out under pressure.

2. INSPECT RADIATOR CAP

NOTICE:
- If the radiator cap has contaminations, always rinse it with water.





- Before using a radiator cap Lester, wet the relief valve and pressure valve with engine coolant or water.

Using a radiator cap tester, pump the tester and measure the relief valve opening pressure.

Standard opening pressure:
93 - 123 kPa (13.5- 17.8 psi)
Minimum opening pressure:
78 kPa (11.4 psi)





HINT: Use the tester's maximum reading as the opening pressure. If the opening pressure is less than minimum, replace the radiator cap.