Checking Radiator Cap

WARNING: This page is about a different car, the 2011 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

Check valve seat of radiator 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.
  
  Fig 1: Identifying Valve Seat Of Radiator Cap And Metal Plunger
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 radiator cap negative-pressure valve.
- Make sure that the valve operates properly while opening and closing.
  
  Fig 2: Pulling Negative-Pressure Valve
Check radiator cap relief pressure using suitable tool and Tool.
Tool number : EG17650301 (J-33984-A)

Standard: 98 - 118 kPa (1.0 - 1.2 kg/cm ² , 14 - 17 psi)

Fig 3: Checking Radiator Cap Relief Pressure
- When connecting the radiator cap to the tester, apply water or coolant to the cap seal surface.
- Replace radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.
Replace the radiator cap if it exceeds the specifications in the above tests.

CAUTION: When installing the radiator cap, thoroughly wipe out the radiator filler neck to remove waxy residue or foreign material.