Reason for this vent problem?

On my Cavy, when I have the heat or anything on, it tends to blow out a lot more on the passenger side vents? Anybody know why it would be doing this? Wouldn't be a big deal if it wasn't for the passenger getting almost all the heat. :lol:

ttt

Sounds like a duct tube came loose inside the dash or underneath the dash or could be clogged. Stuff does get thru and into the ducts or you have a little critter making a nest.

Hmm...thanks for the help. Guess I'll have to pull it apart at some point.