Heating driver seat wont work

SOURCE: Heating System

there should be a heater relay fuse under the hood.

SOURCE: 03 Bonneville issues.

stat is located on drovers side right beside cross over exhaust pipe. and if you remove your leather of the seat cussion you will find a melted spot resoilder and tap up should work.

SOURCE: heated driver seat problem

I just repaired one not long ago.It was a 2001 with heated seats.The first thing you can do is switch the switches to see if the problem moves to the other seat.There are at least three little heaters attached to the foam,that is bonded to the leather.One had a broken wire,the other two [that I know of in the base] tested good.Seems they all have to be working,so everyone must be tested for continuity,with out being pluged in to the others.The only way to see whats going on is to somewhat remove the leather from the seat. With extreme care I was able to get more wire out of the heater and soldier it back on.Then used silicone or 3m window welder around[I don't remember wich] to protect it as that is how it kind of it from the factory. It looked like the wire broke at the edge of the protective part due to sitting on the seat too many times. Bad design,to hold up over time.

SOURCE: I have a 2000 pontiac

Wow!
The first thing you need to do is fill the coolant up again and take it to a shop that you trust,have them pressurize the coolant system to find the leak,then repair it.
But my fears are that who ever check it for you last saw a head gasket leaking and didn't want to fix it so said nothing,Also if your seeing white smoke behind you that is an engine burning antifreeze.