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Radiator Cap Testing

  1. Remove the radiator cap, wet its seal with engine coolant, then install into pressure tester.
    Fig 1: Testing Radiator Cap
    G00719179Courtesy of KIA MOTORS AMERICA, INC.
  2. Apply a pressure of 93.16-122.58 kPa (0.95-1.25 kg/cm2 , 13.51-17.78 psi).
  3. Check for a drop in pressure.
  4. If the pressure drops, replace the cap.
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