Hi John
I guess I should've also noted the type of engine in the main body of my
email.
Sorry about that.

This is regarding a vanagon 2.1 WBX.

I was referring to the hose that connects the long metal pipe around engine
bay, to upper (5/8" ?) nipple on the expansion tank.

As far as I know, air bubbles are NOT flowing into this tank all the time.

Searching the archives, it seems the fault **may** lie at the blue cap at
that tank, which was replaced  during the cooling system rebuild.

Neil

Air bubbles were flowing from that hose in to the expansion tank

On Saturday, June 4, 2016, John Rodgers <jrodgers113@gmail.com> wrote:

> Neil, what engine!
>
> On a 2.1 WBX the only hose that should come from the top of that expansion
> tank is from the pressure cap to the overflow tank.
>

--
Neil n

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