Engine Compression & Cooling System Tools

Why do professional mechanics use a Venturi Vacuum Coolant Refill tool instead of simply pouring coolant into the radiator neck?

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 Correct IncorrectVacuum refilling draws a vacuum on the entire cooling system. Opening the valve draws coolant into every crevice, greatly reducing trapped air pockets that cause engine overheating.

Why do professional mechanics use a Venturi Vacuum Coolant Refill tool instead of simply pouring coolant into the radiator neck?

• It filters out fuel particles from the water pump
• It makes the antifreeze glow in the dark
• It increases the horsepower of the vehicle
• It creates a vacuum that draws coolant in with far fewer trapped air pockets or hotspots