Hey guys, new here! My A4 (TDI) has no air coming through the vents although I do hear the air being 'pulled' under the glovebox. Checked the filter in-case of a block but problem persists even with filter removed. I don’t think it’s the blower as I can hear it running. Does anyone have any suggestions? Thanks a mill. 

Suspect motor modules that direct airflow. Either electrical or mechanical. They’re expensive and there’s a little work to replace. Get the car scanned with VCDS, once you know which modules, then you may be able to DIY fix under glove compartment (which you need to review). 

Thank you. I'll have a look this weekend and report back what I've found for anyone in the future.