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Home >> Kia >> 2021 >> Rio LX >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling System >> Radiator >> Repair Procedures >> Inspection >> Radiator Cap Testing
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Radiator Cap Testing

  1. Remove the radiator cap, wet its seal with engine coolant, then install it on a pressure tester.
    G13704042Courtesy 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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