How to Use a Cooling System Leakage Tester and Vacuum-Type Coolant Refilling Kit

A vehicle’s cooling system is essential for keeping the engine at optimal operating temperatures. Over time, leaks or trapped air pockets can cause overheating, engine damage, and costly repairs. That’s why professional mechanics and DIY enthusiasts rely on two essential tools: the Cooling System Leakage Tester and the Vacuum-Type Coolant Refilling Kit.

These tools are often used together — first to diagnose leaks, then to refill coolant without air pockets.

1. Before You Begin

• Ensure the engine is completely cool before removing the radiator cap.
• Wear protective gloves and safety glasses.
• Prepare the correct coolant type and mixture according to the vehicle manufacturer’s specifications.

2. Pressure Testing – Cooling System Leakage Tester

Purpose:

To check if the cooling system is sealed and free of leaks before refilling.

Steps:

1. Remove the radiator cap or expansion tank cap.
2. Select the correct adapter for the vehicle’s cooling system.
3. Attach the tester’s pump securely to the adapter.
4. Pump to the system’s specified pressure (usually 13–16 psi / 0.9–1.1 bar).
5. Observe the gauge: If the pressure remains stable for several minutes, no leaks are present. If the pressure drops, inspect all components (radiator, hoses, water pump, heater core, engine block) for leaks.
6. If the pressure remains stable for several minutes, no leaks are present.
7. If the pressure drops, inspect all components (radiator, hoses, water pump, heater core, engine block) for leaks.
8. Repair any leaks before proceeding to the refilling stage.

3. Vacuum Refilling – Vacuum-Type Coolant Refilling Kit

Purpose:

To remove air from the cooling system and refill it with coolant without creating air pockets.

Steps:

1. Connect the vacuum filler to the radiator neck or expansion tank.
2. Attach the compressed air supply to the tool and create a vacuum in the system (watch the vacuum gauge; target: -20 to -25 inHg).
3. Close the valve and check for vacuum loss. If the gauge drops, a leak is still present and must be repaired.
4. Place the coolant hose into a container of the correct coolant mixture.
5. Open the valve to allow coolant to be drawn into the system under vacuum.
6. Once filled, remove the tool and reinstall the radiator cap.
7. Start the engine, run to operating temperature, and check for proper coolant circulation and heater function.

4. Important Safety Notes

• Never exceed the manufacturer’s recommended pressure during testing.
• Only use clean coolant to prevent contamination.
• Dispose of used coolant according to local environmental regulations.

 5. Product  Advantages 

Our cooling system testing and refilling product range includes radiator cap adapters for various vehicle models and offers the most commonly used specifications in the market, meeting the needs of passenger cars, commercial vehicles, and motorcycles.

Contact us for more product information and catalogs — we will provide you with the most suitable professional solution.  

 6. Similar options: 

CAK0063-26 TAIWAN CALIBRE 26pc Cooling System Leakage Tester

Buy now

CAK0063-27 TAIWAN CALIBRE 27pc Cooling System Leakage Tester Kit

Buy now

CAK0063-28 TAIWAN CALIBRE 28pc Cooling System Leakage Tester

Buy now

CAK0063-29 TAIWAN CALIBRE 29pc Cooling System Leakage Tester

Buy now

CAK0063-31 CALIBRE 31pc Cooling System Leakage Tester and Vacuum-Type Coolant Refilling Kit

Buy now