Hot air in driver's footwell should come from slots, about 3-4" long where the hard plastic and the carpeted sections meet under the dash. Mine had no air from slots, while passenger side had air.

The only cold air with fan power should be the center console to the rear venetian blind in the center, cold air whether cooling or heating. This is usually shut off for rear seat passenger comfort, but if the plenum is leaking, it could be the source for your cold air.

You could try removing the under-dash panels, 3 philips screws under the pry-off covers at the back of the tray, then 2 or 3 (I don't know, mine has 2 remaining) 1/4 turn large plastic fittings, they look like screws but only turn the 1/4 turn to release and 1/4 turn to lock. With the panels out of the way, maybe you can see/feel for the soruce of the air.

Best Regards,
jim