Checking Radiator Cap

WARNING: This page is about a different car, the 2003 Nissan Altima. 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: Pulling Negative Pressure Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
Check radiator cap, apply pressure to cap using Tool.
1. Radiator cap relief pressure
2. Standard : 78 - 98 kPa (0.8 - 1.0 kg/cm ² , 11 - 14 psi)
3. Limit : 59 kPa (0.6 kg/cm ² , 14 psi)
- When connecting the radiator cap to the Tool, apply water or coolant to the cap seal surface.
- Replace the cap if the there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.
Fig 2: Checking Radiator Cap For Leak
Courtesy of NISSAN MOTOR CO., U.S.A.