Well after just about 3 years of ownership, beloved 2007 s2k has finally given me its first issue. Right after I got the title in the mail no less...

When I turn the HVAC knob to dash vents or dash & footwell mix, I can not get any airflow out of the dashboard vents. Regardless of fan speed or temperature setting (full heat or full cold AC.) The fan is working fine, and will blow hard out of the footwells, but nothing from the dash.

Has anyone else experienced this? Any ideas where to look and start troubleshooting? I tried searching, but could not find anything really related.

Any ideas are appreciated, as I don't want to pay a stealership to diagnose and fix it.