Heater/ AC Control problem

[zagato]

I am having a problem with my heater/ac controls.  When selecting the control buttons it does not matter whether the vent, floor or defroster is selected.  The air mostly comes out of the defroster and a bit out of the heater regardless but not the vents.  I suspect it is a vacuum problem.  Can anyone suggest where to start?

[Art Dalby]

Zagato, Had same problem. found 2 very thin tubes running from the vacume tank on top of the engine down to the bottom of the firewall in front of where the hvac controls are behind there. I just touched one and it crumbled, touched the other and it did also. Didn't want to fight running lines through the firewall so I broke off the lines, leaving an inch or two coming out. Took a piece of the broken line to O'Reillys and got two pieces of rubber hose to fit over the ends I left stick out, slipped them on and have had air ever since.--Art Dalby, Viera, Fl.