Is it possible to have carbon dioxide or some other stuff come out of your vents to make you tired kind of, because like what i said in my other post my fan is stuck on and its making a weird smell and i dont know if its in my imagination but i get tired.

 

Why not just open the windows a bit?

Or, you can leave the recirculation off and fresh air will come in when at speed.

 

read my other post, my ****s broke... my **** wont turn off no matter what!

 

i think you mean carbon MONOXIDE. that will make you feel tired because it binds to your red blood cells instead of oxygen therefore making you sleepy. if you are running the car in an enclosed area (garage) then it could kill you. if you are driving and you think you're getting tired who knows...carbon monoxide is odorless and tasteless.