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Coolant Vacuum Filling

Mod Description
How to fill your drained engine with coolant with no air locks
Mod Details
PremiumYes Difficulty Mod ID1074 Creditevilution For450 Fortwo451 ED451 Fortwo452 Roadster453 EQ453 Fortwo/Forfour454 Forfour Link Copy to Clipboard

Vacuum Filling

Vacuum filling the coolant into an engine is a trick adopted by many car manufacturers. It allows coolant to be drawn into the system with no air locks so the engine doesn’t require bleeding.

This saves time, effort and spilt coolant.

Instead of pushing coolant in under pressure or pouring the coolant in and using gravity to fill the system from the bottom upwards, vacuum filling pulls all of the air from the coolant system leaving little to no air to create an air lock. The vacuum in the system pulls the coolant in and evenly distributes around the entire system.

Air Locks

Bleeding the air locks out of the petrol 450 and Roadster is an easy one. The petrol 451 is a bit more of a pain but but can be done with simple tools. The same can’t be said for the diesel engine in the 450 and 451. It is possible but it’s a bit of a mess about. The 451 ED must be vacuum filled too.

Expensive Equipment

Nope, not any more. When I made my own vacuum filling tool, the cost of buying the actual tool was excessive. The cheapest set was £150, so I made my own. I’ll leave the information as you might have a lot of the parts already.

However, as with most things, there are now cheap Chinese versions that are very cheap. Much cheaper than making it yourself.

Vacuum Filling Kit
Vacuum Filling Kit
Vacuum Filling Kit
Vacuum Filling Kit

Make Your Own


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