Checking Radiator Cap

WARNING: This page is about a different car, the 2003 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

Pull the negative-pressure valve to open it, and make sure it close completely when released.

Fig 1: Pulling Negative-Pressure Valve To Open
Courtesy of NISSAN MOTOR CO., U.S.A.
- Make sure there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve.
- Make sure there are no abnormalities in the opening and closing conditions of the negative-pressure valve.
Check radiator cap relief pressure.

Fig 2: Checking Radiator Cap Relief Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.
Standard
1. : 78-98 kPa (0.8-1.0 kg/cm ² , 11-14 psi)
Limit
1. : 59 kPa (0.6 kg/cm ² , 9 psi)

When connecting the radiator cap to the radiator cap tester adapter (SST) and radiator cap tester (commercial service tool), apply engine coolant 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.