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Checking Radiator Cap

WARNING: This page is about a different car, the 2004 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Pull negative-pressure valve to open it and make sure that it closes completely when released.
    • make sure that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
    • make sure that there are no unusualness in the opening and closing conditions of the negative-pressure valve.
    Fig 1: Pulling Negative Pressure Valve For Checking Opening And Closing
    G00732018Courtesy of NISSAN MOTOR CO., U.S.A.
  2. 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) 
    • When connecting radiator cap to radiator cap tester (commercial service tool) and radiator cap tester adapter (SST), apply engine coolant to the cap seal surface.
    • Replace radiator cap if there is an unusualness in negative-pressure valve, or if the relief pressure exceed the limit.
Fig 2: Checking Radiator Cap Relief Pressure To Standard
G00732019Courtesy of NISSAN MOTOR CO., U.S.A.
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