![]() The mechanic releases the valve and slowly adds coolant to fill the system – without adding any air bubbles to the system.Once the vacuum pressure stabilizes, the airline is reversed and a coolant refill tube is inserted into a container of pre-mixed coolant.The device remains activated until a vacuum pressure ranging between 20 to 30 psi is achieved.Any air bubbles or debris stuck inside the coolant system will be sucked away through lines, chambers and into the reservoir. Once the vacuum coolant filler is secured to the overflow reservoir, it is activated and a vaccuum is created.Before adding coolant, the mechanic uses the vacuum coolant filler to remove any existing air trapped inside the coolant system.The mechanic finishes any repairs or service to the coolant system, or diagnoses and repairs any mechanical issues that lead to overheating.Here are the basics on how vacuum coolant fillers work: However, in order to work correctly, the mechanic should follow specific instructions supplied by the tool manufacturer (as each individual vacuum coolant filler has specific instructions regarding care and use). The vacuum coolant filler is an exceptional tool that can prevent air bubbles from being trapped inside the coolant system or remove bubbles that currently exist. There are multiple attachments available, so a mechanic would need to order several of them to fit most US and foreign applications. The tool itself is a pneumatic device that includes an attachment that is secured to the overflow reservoir cap. ![]() The vacuum coolant filler is designed to eliminate this by creating a vacuum that removes all bubbles trapped in the line, then adds coolant to the vacuum sealed coolant system. However, doing so could result in potentially dangerous situations of creating air bubbles inside the coolant system. After a mechanic has completed routine coolant or radiator service, it is common for them to add coolant to the overflow reservoir in an effort to "top off the tank". ![]()
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