I had the same exact problem on my 2000 LeSabre. Lots of clicking
going on under the seat when pushing the heater button, but the
indicator light would stay on HI. Turning the key off was the only
way to reset it off.
It was out of GM warranty but still under an extended warranty. They
replaced the heater element in the seat which solved the problem. I
think it was about a $1000.00 job.
FYI, checkout
www.alldata.com for tsb 01-08-50-012a Nov 02, interior -
front heated seat inoperative. I don't know if this helps since I
don't have access to the full description.
Good luck!!!
>> Stay informed about: 2000 Buick Lesabre Limited