VZ Acclaim Fan stuck on windscreen

[Growley]

I recently bought a VZ V6 Acclaim & the fan works but turning the selector knob doesn't do anything. The air only goes up to the front windscreen. I've currently got the dash surrounds out & everything seems to be connected. Any ideas? I've had a look at some other threads that seem to indicate a vacuum leak. Are there any common failure points? Not quite sure where to start in diagnosing a possible vacuum leak...

Edit: I found the tiny vacuum hose that has the one way valve was not connected to the back of the inlet manifold. Reattaching it didn't fix the problem.

 

[99notout]

Is the one way valve backwards??

 

[Growley]

Sorted. There were 2 problems.
1. Vacuum hose in inlet manifold not connected
2. Vacuum supply hose not connected to vent selector dial. I used the info in this link to help trace the hoses.

Here are the images from the link in case the link dies.

 

[Growley]

Is the one way valve backwards??

Valve was on OK but while i was checking it I realised the heater tap valve looks like it should be replaced so thanks for making me check!