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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: Checking Radiator Cap
    G05964273Courtesy of AMERICAN HONDA MOTOR CO., INC.
  2. Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm2 , 13.5-17.8 psi).
  3. Check for a drop in pressure.
  4. If the pressure drops, replace the radiator cap.
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