Alright so I drove to work this morning everything was fine. Left work drove about 2 miles. Windows started fogging up. Felt the vents and the air just trickles out. (i can blow harder than it) switched directions and it all switches but comes out with the same pressure. Air is hot and blower motor is working and sounds like it's at normal speed

Side note: blower motor only works on high. Been like that since I got the truck. Haven't gotten around to fixing. I'm not sure if that has anything to do with it or not