How to Pressure Test a Radiator and Cap

Below guide will teach you How to Pressure Test a Radiator and Cap . Please follow the instructions carefully.

Things You’ll Need:

  • Flashlight
  • Cooling System Pressure Tester
  • Mirror

Estimated Costs:

  • DIY Costs: Est. $0.00 parts only
  • Shop Costs: Est. $276.68 parts and labor


  • Make sure that the engine is cold. Prop the engine hood up.
  • Adjust the cooling system pressure tester on the radiator. Follow manufacturer’s manual for proper installation.
  • Apply pressure with the pressure tester and look carefully for any leakage.
  • Make sure that the radiator cap hold the pressure, otherwise replace it with new cap.

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