How To Pressure Test Automotive Cooling System

Posted: December 22, 2020 By: MattM

Cooling system problems can be a headache and can even damage an engine if it isn’t taken care of quickly. The best way to quickly check a cooling system for leaks, cracks, or other issues is by pressurizing the system with a Coolant System Pressure Tester Kit. Check out the simple steps to check yours below.

  1. Remove the original radiator cap after assuring that the cooling system is depressurized and cool.
  2. Choose the correct radiator cap for the vehicle being tested from the test kit and install on cooling system opening.
  3. Remove the hand pump assembly from the test kit and fasten the quick coupler at the end of the hose to the radiator cap securely. Operate the hand pump until reaching the pressure recommended by the vehicle manufacturer. DO NOT exceed vehicle manufacturer’s recommended pressure or maximum gauge range pressure of 35psi (2.5bar).
  4. Check the pressure reading on the gauge immediately after reaching the vehicle manufacturer’s recommended pressure. If the pressure reading drops, there is a leak in the cooling system. After pressure testing is completed, press the release button on the quick coupler until the reading on the gauge reads 0. Remove quick coupler from radiator cap and then remove radiator cap from the cooling system opening. Locate the leak and repair as necessary.

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