Quote Originally Posted by Richard View Post
See if it sucks or suck it and see? LOL!

I did initially try connecting a pipe to the valve (top of pic) with the end in some coolant but it just blew bubbles!

There doesn't seem to be any venturi effect....
What pressure did you use?
If it is a venturi, and you used too high a pressure, the restriction of the outlet would cause it to blow air out the coolant inlet, instead of creating a vacuum.
Most of these things are designed to run around 1-3bar, so start with a pressure regulator fully wound off, then gradually increase the pressure.