Radiator Cap: Testing and Inspection

Checking Radiator Cap





^ Check valve seat of radiator cap.
- Check if valve seat is swollen to the extent that the edge of the plunger cannot be seen when watching it vertically from the top.
- Check if valve seat has no soil and damage.





^ Pull negative-pressure valve to open it, and make sure that it close completely when released.
- Make sure that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
- Make sure that there are no unusualness in the opening and closing conditions of negative-pressure valve.





^ Check radiator cap relief pressure.
Standard: 78 - 98 kPa (0.8 - 1.0 kg/cm2, 11 - 14 psi)
Limit: 59 kPa (0.6 kg/cm2, 9 psi)
- When connecting radiator cap to the radiator cap tester (commercial service tool) and the radiator cap tester adapter [SST], apply engine coolant to the cap seal surface.
^ Replace radiator cap if there is an unusualness related to the above three.

CAUTION: When installing radiator cap, thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.