Heating/Ventilation issue

[mcflux]

For a while now I've had a problem with my heating, where it'll warm up the car to whatever temperature I set the CC at, but the passenger footwell always blasts out cold (not air conditioned) air. Driving back from melbourne today, the ambient temp was 3* and I could really feel the cold coming in!

So E-Series fix0rs of fux0red things, whaddyareckon the problem(s) may be, and how could/should I fix it? Are E-Series heating/cooling vents vaccuum operated? Does anyone have available the vent layout/diagrams or any other things that may help me in fixing this? And if it's a bugger to fix (ie pulling out the whole dash), how much do you think it'll cost to fix?

Cheers,

-Dave-

PS for those who don't know, I have an EB Ghia with the digital climate control, however I doubt it has something to do with the climate control itself.