Checking Radiator Cap

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

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.
- Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.
Fig 1: Checking Radiator Cap
Courtesy of NISSAN MOTOR CO., U.S.A.
Check radiator cap relief pressure.
1. Standard : 78 - 98 kPa (0. 8 - 1. 0 kg/cm ² , 11 - 14 psi)
2. Limit : 59 kPa (0. 6 kg/cm ² , 9 psi)
  
  Fig 2: Checking Radiator Cap Relief Pressure
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - When connecting the radiator cap to the radiator cap tester adapter (SST) and radiator cap tester, apply water or LLC to the cap seal part.
  - Replace the radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.