RADIATOR CAP: Inspection

Check valve seat of radiator cap.
- Check if valve seat (A) is swollen to the extent that the edge of the metal plunger (B) cannot be seen when watching it vertically from the top.
- Check if valve seat has no soil and damage.
  
  Fig 1: Identifying Valve Seat And Metal Plunger
  Courtesy of NISSAN NORTH AMERICA, INC.
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 radiator cap negative-pressure valve.
- Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.
  
  Fig 2: Checking Negative-Pressure Valve
  Courtesy of NISSAN NORTH AMERICA, INC.
Check radiator cap relief pressure.
- When connecting radiator cap to the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool) (A), apply engine coolant to the cap seal surface.
  Standard and limit: Refer to "RADIATOR ".
  
  Fig 3: Checking Radiator Cap Relief Pressure Using Radiator Cap Tester
  Courtesy of NISSAN NORTH AMERICA, INC.
Replace radiator cap if there is an unusualness related to the above three.

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