Hey all, I don't know if the same rules apply to MK3, but I've got the same problem.
EATC. Basically, it seems air is only being directed to the windscreen and the two side blower aimed at the front windows near the mirrors.
When pressing the direction buttons I can hear motors whirring, and i can also feel a slight warm blow of air in the passenger footwell, however the rear seats get no airflow at all. - EDIT I can only hear motors whirring when I press the front vent button. The windscreen and footwell buttons (although they light up) don't seem to make any noise behind the dash.
I took this photo of what I'm assuming are direction flaps (in white). The front one turns back and forth when the front vents button are pushed. The back one doesn't move at all. Could this be the culprit?
PS . The right hand side of the photo is towards the cabin, the left hand side is towards the front of the car.
Can anyone shed some light on this?