- Check the radiator cap valve seat.
A. Valve seat; B. Metal plunger.
- Check to see if the valve seat is swollen to such an extent that the edge of the plunger is not visible when viewed vertically from above.
- Make sure the valve seat is free of dirt and damage.
- Pull the vacuum valve open and make sure it closes completely when released.
- Make sure the radiator cap vacuum valve seat is free of dirt and damage.
- Make sure that there is no abnormality when opening and closing the vacuum valve.
- Check the radiator cap release pressure.
Standard and limit*. See chapter "Engine lubrication and cooling system".
- When connecting the radiator cap to the pump (suitable special tools) (A) and adapter (special tool) (IN) Apply engine coolant to the seal.
- If the vacuum valve shows abnormalities in the three points above, replace the radiator cap.
Attention. Before replacing the radiator cap, thoroughly wipe the radiator filler neck to remove any waxy deposits or foreign particles.