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Radiator Cap Pressure Test

  1. Use an adapter to attach the cap to the tester.
  2. Increase the pressure until the gauge stops moving.
    1. Main valve opening pressure: 83-110 kPa (0.83-1.1 kg/cm2 , 12-16 psi)
    2. Vacuum valve opening pressure: -7 kPa (-0.07 kg/cm2 , -1.0 psi)
  3. Check that the pressure level is maintained at or above the limit.
  4. Replace the radiator cap if the reading does not remain at or above the limit.
    NOTE: Be sure that the cap is clean before testing, since rust or other foreign material on the cap seal will cause an incorrect reading.
    Fig 1: Pressure Testing Radiator Cap
    G00973286Courtesy of HYUNDAI MOTOR CO.
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