Checking Radiator Cap

To check radiator cap, apply pressure to cap with a tester.

Radiator cap relief pressure Standard: 78 - 98 kPa (0.8 - 1.0 kg/cm ²  , 11 - 14 psi) 

Limit: 59 - 98 kPa (0.6 - 1.0 kg/cm ²  , 9 - 14 psi) 

Fig 1: Checking Radiator Cap

Courtesy of NISSAN MOTOR CO., U.S.A.

Pull the negative pressure valve to open it. Check that it closes completely when released.

Fig 2: Pulling Negative Pressure Valve To Open

Courtesy of NISSAN MOTOR CO., U.S.A.