I have air coming through all my vents except the vent on the driver side. Where should I start to resolve this issue?
Start at the offending vent and work backwards. Could be as simple as a loose or unsecured vent tube.
There is a large hard plastic duct that runs just above your knees, under the steering column. It has flexible sections on both ends and they can easily come loose over the years and become disconnected. Or they could be missing altogether. Someone could have left it off after a stereo install or repair, you never know... If you're missing pieces I'm sure someone on here has what you need. Good Luck Philip T.