Radiator Cap: Inspection

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.

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 & Metal Plunger
  Courtesy of NISSAN MOTOR CO., U.S.A.
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: Pulling Negative-Pressure Valve To Open
  Courtesy of NISSAN MOTOR CO., U.S.A.
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
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.