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Radiator Cap Test

  1. Wait until the engine is cool, then carefully remove the radiator cap (A). Wet the radiator cap seal with engine coolant, then install it on a commercially available pressure tester (B).
    Fig 1: Removing Radiator Cap
    G08075389Courtesy of AMERICAN HONDA MOTOR CO., INC.
  2. Apply a pressure of 93.3-122.7 kPa (0.951 - 1.251 kgf/cm2 , 13.53-17.79 psi).
  3. Check for a drop in pressure.
  4. If the pressure drops, replace the radiator cap.
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