Back-To-Basics: Vacuum Coolant Filler

Posted on 14 February 2025 Print

Sometimes, going back to the basics can make the difference between a quality repair and a failed repair. Vacuum coolant fillers can cut down on comebacks as well as speed up an everyday process.

In the past, the technician would either fill the reservoir or the radiator, run the vehicle, and then burp the air from the system. This can be a long process, not made easier with the addition of rear heating and cooling in some SUVs.

Not only is a vacuum filler faster, but it also doubles as confirmation that the system can maintain a vacuum or pressure. Unobstructed cooling has become more important with the increasing popularity of electric vehicles (EVs). If there is an airlock or a leak in the cooling system of an EV, it can lead to battery pack damage or a fire.

Multiple OEMs not only recommend but may require vacuum fillers for refilling the coolant system. This process can eliminate the need to bleed the cooling system, avoiding the air lock issue that can cause many comebacks if not noticed before delivery. Some vehicles need a scan tool to properly fill the cooling system. Always reference vehicle- specific procedures for tools needed, capacities, and coolant type.

Using a vacuum to fill the cooling system, pulling from a reservoir of new, clean, specified coolant to fill the system after service, can also improve productivity.

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