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Radiator Test

  1. Wait until the engine is cool, then carefully remove the radiator cap and fill the radiator with engine coolant to the base of the filler neck.
  2. Attach a commercially available pressure tester (A) to the radiator, and apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm2 , 14-18 psi).
    Fig 1: Identifying Commercially Available Pressure Tester
    G05952710Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Inspect for engine coolant leaks and a drop in pressure.
  4. Remove the tester, and reinstall the radiator cap.
  5. Check for engine oil in the coolant and/or coolant in the engine oil.