air cond vacuum problem

[harry3]

my factory air cond suddenly stopped working
elleries says to check a check valve on the vacuum line from the manifold to the vacuum tank
I cant find this valve
anyone know where it is or what it looks like
some of the air cond controls are vacuum operated

[Bax]

The vac tank is the little ball at the front of the car, so going by that there should be a hose coming off it running to your manifold? I didn't know that was the case but fair enough if it is.