2003 Focus ZTW
Basically I'm having the same kind of issue this guy is having.
Except that my air does blow cold but its not engaging the air recycle properly. Easily noticeable if I'm driving by a swampy area or water treatment facility. With the recycle air button on it still acts like its off, for example I'll have had it on then turn off the blower and because I'm still driving the outside air is pushing the remaining cold air through the vents.
The vent selector works, switches the not working recycle off when it goes to defrost, heater door makes a thunk when switching fast from hot to cold, not to sure about cold to hot.
Its really starting to bother me since they're doing loads of construction and the tar and exhaust smells are making me sick. I've brought the car back to get it serviced for this but they just said it was working fine, drove it home and noticed too late that they didn't fix it. I want to exactly what is wrong so I can tell them to fix it, because I'm still under the 30 day warranty.
Also every time I start the car the recycle button is off, I'm pretty sure that't not a 'feature'.