Checking Radiator Cap

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

Pull negative-pressure valve to open it, and make sure it close completely when released.
- Make sure there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
- Make sure there are no abnormalities in the opening and closing conditions of negative-pressure valve.
  
  Fig 1: Checking Radiator Cap
  Courtesy of NISSAN MOTOR CO., U.S.A.
Check radiator cap relief pressure.
Standard:

78 - 98 kPa (0.8 - 1.0 kg/cm² , 11 - 14 psi)

Limit:

59 kPa (0.6 kg/cm² , 9 psi)
- When connecting radiator cap to radiator cap tester adapter [SST] and radiator cap tester (commercial service tool), apply engine coolant to the cap seal part.
- Replace radiator cap if there is an abnormality in negative-pressure valve, or if the open-valve pressure is outside of the standard values.
Fig 2: Testing Radiator Cap
Courtesy of NISSAN MOTOR CO., U.S.A.