ontop of the fan only working on high for my air cond it is only blowing on the windscreen no matter which setting i have it on.
im not sure if this is connected but out of the 2 black and one green vacuum type pipes that come thru the firewall from the dash,behind the washer bottle,only the green is connected to anything.
thanks again for helping the new guy.

all the baffles in the air box are controlled by vacum. with no vacum, it defaults to demister. so yes a whole bunch of disconected lines could quite likely be the cause.

MAX fan setting is controlled separately by a relay near the bonnet release. so all other speeds may be related to the resistor speed controller at the airbox or some other disconnected wiring behind the dash.
hope this helps