Coolant Reservoir: Service and Repair

RADIATOR

RESERVOIR TANK CAP : Inspection






- Check valve seat (A) of reservoir tank 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 check that it close completely when released.
- Check that there is no dirt or damage on the valve seat of reservoir tank cap negative-pressure valve.
- Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.





- Check reservoir tank cap relief pressure.
Standard and limit: [1][2]Specifications.
- When connecting reservoir tank cap to the radiator cap tester and the radiator cap tester adapter (commercial service tool) (A), apply engine coolant to the cap seal surface.
- Replace reservoir tank cap if there is an unusualness related to the above three.

CAUTION:
When installing reservoir tank cap, thoroughly wipe out the reservoir tank to remove any waxy residue or foreign material.