After searching this site, I found an easy 10 minute fix to make the driver's heated seat work on our 96 850T. Here is a summary of what I did. The heated seat light would come on, the passenger seat would get hot, but the driver's seat didn't.

Raised seat all the way up and moved forward. Sure enough there was a red wire hanging down from the middle of the seat where it had "broken off" from the thermostat that is up in the seat. I got my hand up there and worked the thermostat (a device smaller than your thumb) out. (It is attached to a plastic collar--sort of like what a dog wears around it's neck to keep licking where it has stitches. ) Unplugged the other wire, reclamped the broken wire to the "plug thing", plugged both wires back in, shoved the thermostat back up into the seat cavity, turned it on, and it worked.

This is my wife's car and the heated seats are her favorite part. And yes, our A/C leaks freon and yes our microswitch is quirky. The car is is like a hollywood starlet: good looking, good name, but upclose the little nagging failures are annoying.