vent air flow

My left upper vent doesnot let any air flow out of it. With seletor to vent position still no air even with fan turned on hi. Other vents work fine. madza 3 s sport 207 year. 2.3l eng.

Is it the one facing you or the windshield?

It is the left upper vent facing the driver. Air not commimg out at all on any settings.

Any chance it was taking apart before? The duct runs to the firewall.... hard to diconnect it

No it has not ben taken apart. This just startd about three months ago.Out of the clear blue sky it just quite lowing from this vent. I did feel under the dash to were the vent location is and kinda of mover thins a little that I couldnot see and it worked for about three days but didnot seem to blow as much as it did before but quite altogether again.