The Baxter bong.

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Seeing as it’s fashionable to give wacky contraptions stupid names here’s our shameless copy of Andrews “LibbyBong”. Idea being that water finfs it’s own level and the funnel on top is higher than the top of the radiator.
It kinda works. It does speed the process up a little up we do still run the system up to temp and check the cooling fan operation.
The blue pipe goes down into the header tank, the white pipe takes air and bleeds it to atmosphere from the top of the header tank.