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Radiator Cap: Inspection

  1. Attach the radiator cap to tester.
    Fig 1: Attaching Radiator Cap To Tester
    G00995611Courtesy of SUBARU OF AMERICA, INC.
  2. Increase the pressure until tester gauge pointer stops. Radiator cap is functioning properly if it holds the service limit pressure for 5 to 6 seconds.
  1. Standard pressure:  93-123 kPa (0.95 - 1.25 kg/cm2 , 14 - 18 psi)
  2. Service limit pressure:  83 kPa (0.85 kg/cm2 , 12 psi)
CAUTION: Be sure to remove foreign matter and rust from the cap in advance other wise, results of pressure test will be incorrect. 
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