For 1990-2009 cars only
- Inspect the radiator cap sub-assembly.
- Measure the valve opening pressure.
- Inspect that the rubber seals (1, 2) and (3) are not deformed, cracked or swollen.
- Inspect that the rubber seals (3) and (4) are not stuck together.
- Apply engine coolant to rubber seals (2) and (3) before using a radiator cap tester.
- When using the cap tester, tilt it upwards 30 degrees or more.
- Pump the cap tester several times, and check the maximum pressure (1).
If there are water stains or foreign matter on rubber seal (1, 2) or (3), clean the part(s) with water and finger scouring.
Note: Even if the cap cannot maintain the maximum pressure, it is not defective.
Pumping speed is one pump per second.
If the maximum pressure is less than the minimum standard value, replace the radiator cap sub-assembly.
