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Home >> Infiniti >> 2003 >> Q45 >> Repair and Diagnosis >> External Pages >> Different car >> Section 205 (Engine Cooling System) >> Radiator >> Removal And Installation >> Checking Radiator Cap

Checking Radiator Cap

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  1. Pull negative pressure valve to open it, and check that it closes completely when released.
      Fig 1: Checking Negative Pressure Valve Condition
      G00743248Courtesy of NISSAN MOTOR CO., U.S.A.
    • Check that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
    • Check that there are no abnormalities in the opening and closing conditions of negative-pressure valve.
  2. Check radiator cap relief pressure.
    Fig 2: Checking Radiator Cap Relief Pressure
    G00743249Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Standard : 78 - 98 kPa (0.8-1.0 kg/cm2/, 11 - 14 psi) 
    2. Limit : 59 kPa (0.6 kg/cm2/, 9 psi) 
    • When connecting radiator cap to the radiator cap tester adapter (SST) and the radiator cap tester (Commercial service tool), apply engine coolant to the cap seal surface.
    • Replace radiator cap if there is an unusualness in negative-pressure valve, or if the open-valve pressure exceeds the limit.
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