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Radiator Cap Testing

WARNING: This page is about a different car, the 2005 Kia Spectra5, 2005 Kia Spectra, and 2004 Kia Spectra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the radiator cap, wet its seal with engine coolant, then install it no 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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