Let....

[Paul]

http://i279.photobucket.com/albums/kk140/davieLET/vac_setup.jpg
Beneath number 10 on this diagram the pipe with the one way valve in, is it the three way hose thing where the water inlets go in on the back of it?

[Damo]

its the breather by the looks of things paul but could be wrong.

[Adam]

Yeah looks like it is Paul. That screw in union thing with a breather connection and a joiner thing for the coolant pipes.

[Paul]

Thats the one, god the vacuum system on that cavalier was s mess!

[Benn]

Edit.