Why would my power seat hang up on one side?

You will need either a new/salvaged motor or switch for your seat. One way to troubleshoot is to apply a 12-volt current to the seat motor's power connections and see if the motor moves. If the motor moves (even sluggishly), then the most likely culprit is the switch.

Hello-
If your fuses are good, perhaps your heated seat switch is faulty. You can test the switch for connectivity using a meter to see if power is going through the switch when in the ON position. If the meter shows no power while in the ON position, replace the switch. If power is reaching the seat, then likely the heating element itself within the seat is the culprit.

under the seat there should be 2 bolts (sometimes the factory didn't install them. the seat hangs on 3 hooks. push in on the top of the seat about 5" from the side and lift up. center next. then the other side.

Check the connectors of the power seat that they are properly connected

You will have to fix your panel with epoxy or get one from
salvage yard

I use crazy glue to put things in place
Then slide plastic water tubing from home depot over the
screw posts
Then epoxy -do all that on the inner damaged side
Takes a week to repair those type items or several

Use a really good hot glue stick in a glue gun, or silicone caulk (will have to go 24hrs. w/out use) to set it back in place.

Power seat quit working on driver side.

ITs the power seat motor itself. unplug the harness conected below the seat switch and check if it reciving and current when the switch in on if it does then reconnect it and chech the current on the other wires when u move the switch if it doed then bro u need a new motor .There are four bolts located below the seat.open them and check for a new motor...

I would definitely recommend to replace the seat belt assembly... The only way to know for sure that the seat belt will work properly in the event of a crash is to replace it... Even if you do repair it so it winds back there is no guarantee the repair will hold when you really need it to...

There is a little loop of material hanging under the seat on both sides, pull this towards the front of the truck and the seat will unlatch to fold up.

sounds like a bad relay. Look in the owners manual or on the fusebox cover. It will not be a fuse, but a silvery looking box that pulls out. Youll have to check the documentation to see which one it is in your vehicle.
Sometimes it is under the seat in a Volvo.
check the relay under the seat, make sure it hasn't worked its way loose. if its still tight, the heater pad itself has probably checked out.
If its not the relay, and you want to save some $$, replace the drivers side with the P/S. 'F' the passenger :)