Checking Reservoir Cap

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the reservoir cap.
- Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
- Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the metal retainer.
  NOTE: Thoroughly wipe out the reservoir filler neck to remove any waxy residue or foreign material.
Pull the negative-pressure valve to open it and check that it closes completely when released.
- Check that there is no dirt or damage on the valve seat of the reservoir cap negative-pressure valve.
- Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.
  
  Fig 1: Checking Negative-Pressure Valve Of Radiator Cap
  Courtesy of NISSAN NORTH AMERICA, INC.
Check reservoir cap relief pressure using suitable tool and Tool.
Tool number: - (J-24460-92)

Standard: 98 - 118 kPa (1.0 - 1.2 kg/cm ² , 14 - 17 psi)
NOTE:
- Apply engine coolant to the cap seal surface.
- Replace the reservoir cap if there is any damage in the negative-pressure valve, or if the open-valve pressure is outside of the limit.
Fig 2: Checking Radiator Cap Relief Pressure
Courtesy of NISSAN NORTH AMERICA, INC.