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Radiator Cap Test

  1. Remove the radiator cap (A), wet the seal with engine coolant, then install it on the pressure tester (B) (commercially available). Use a small adapter H-901122-09 (C) (commercially available) to install the radiator cap.
  1. Apply a pressure of 93−123 kPa (0.95−1.25 kgf/cm 2 , 14−18 psi).
  1. Check for a drop in pressure.
  1. If the pressure drops, replace the cap.