Checking Radiator Cap

WARNING: This page is about a different car, the 2003 Infiniti FX45. 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 closes completely when released.
- Make sure there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve.
- Make sure there are no unusualness in the opening and closing conditions of the negative-pressure valve.
Fig 1: Pulling Negative-Pressure Valve To Open
Courtesy of NISSAN MOTOR CO., U.S.A.
Check radiator cap relief pressure.

Fig 2: Checking Radiator Cap Relief Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.

Standard:

78-98 kPa (0.8-1.0 kg/cm ² , 11-14 psi)

Limit:

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 surface.
- Replace the radiator cap if there is an unusualness in the negative-pressure valve, or if the open-valve pressure is outside of the limit.