Skip the auto shop - Our mechanics make house calls

The Best Tool to Eliminate Air Bubbles

The Best Tool to Eliminate Air Bubbles - main image

One of the most difficult problems to identify when diagnosing an overheating situation is air bubbles that are trapped in the coolant system. The coolant system of any water-cooled engine is dependent upon the smooth and clear flow of coolant within the engine block water jackets, coolant lines, water pump, and radiator. Air bubbles may appear inside the coolant system, which increases internal engine temperature; and if not fixed quickly, could result in serious engine damage.

Air bubbles sometimes arise during the time that mechanics perform coolant service. If not taken care of properly, potential serious damage may occur. To solve this, many experienced ASE certified mechanics utilize the vacuum coolant filler and dub it the best tool to eliminate air bubbles during radiator or coolant service and repairs.

The Best Tool to Eliminate Air Bubbles
Image: FJC

What is vacuum coolant filler?

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". However, doing so could result in potentially dangerous situations of creating air bubbles inside the coolant system. 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. The tool itself is a pneumatic device that includes an attachment that is secured to the overflow reservoir cap. There are multiple attachments available, so a mechanic would need to order several of them to fit most US and foreign applications.

How does the vacuum coolant filler work?

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. 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).

Here are the basics on how vacuum coolant fillers work:

  1. The mechanic finishes any repairs or service to the coolant system, or diagnoses and repairs any mechanical issues that lead to overheating.
  2. Before adding coolant, the mechanic uses the vacuum coolant filler to remove any existing air trapped inside the coolant system.
  3. Once the vacuum coolant filler is secured to the overflow reservoir, it is activated and a vaccuum is created. Any air bubbles or debris stuck inside the coolant system will be sucked away through lines, chambers and into the reservoir.
  4. The device remains activated until a vacuum pressure ranging between 20 to 30 psi is achieved.
  5. Once the vacuum pressure stabilizes, the airline is reversed and a coolant refill tube is inserted into a container of pre-mixed coolant.
  6. The mechanic releases the valve and slowly adds coolant to fill the system – without adding any air bubbles to the system.
  7. When the coolant tank is filled to the recommended level, the air supply line is disconnected, the reservoir top attachment is removed and the cap is replaced.

Once a mechanic has completed this process, all air bubbles should be removed from the coolant system. The mechanic then makes sure to inspect for any leaks to the coolant system, starts the engine, verify the coolant temperature and test drives the vehicle.

When you're able to easily remove air bubbles in the coolant system of any vehicle by using vacuum coolant fillers, many overheating situations can be avoided. If you’re a certified mechanic and you’re interested in working with YourMechanic, submit an online application for an opportunity to become a mobile mechanic.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P3427 OBD-II Trouble Code: Cylinder 4 Deactivation/Intake Valve Control Circuit Low
What the P3427 code means When starting, and when the vehicle is operating under heavy weight, the engine will operate in V8 mode. But when driving conditions are light, the engine...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...
P0477 OBD-II Trouble Code: Exhaust Pressure Control Valve Low
P0477 code means that the PCM has detected an abnormally low voltage reading often due to the exhaust back pressure control valve circuit.


Related questions

Q: overheating leaking don't know what the problem is

Your 2002 Mitsubishi Montero has a coolant leak that needs fixed before you damage the engine. You need to have the cooling system pressure tested to see where it is leaking and have that leak fixed. You may have a...

Q: Buying air wrench

You rarely see me use them because my videos are basically made for do-it-yourself kind of guys. I’ve got all kinds of air tools and I use them all the time but I don’t use them much in my videos...

Q: Car overheating and leaking oil

Hello, the first thing to do is check the oil level and get that correct and then diagnose the overheating concern. It will probably need to be jump started to get it going. The cause of the overheating must be...