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Radiator Cap Testing

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  1. Remove the radiator cap, wet its seal with engine coolant, then install it to pressure tester.
    Fig 1: Inspecting Radiator Cap Using Pressure Tester
    G08327742Courtesy of KIA MOTORS AMERICA, INC.
  2. Apply a pressure of 93 ~ 123kPa (0.95 ~ 1.25kgf/cm2 , 14 ~ 19psi).
  3. Check for a drop in pressure.
  4. If the pressure drops, replace the cap.
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