2000 LaSabre issues

Hello. I'm having a few problems with my 2000 LaSabre. 1) The gas gauge is reading either full or empty. When I start the car it shows full and then a short time later drops to empty. A re-start
brings it back to full. 2) Once activated, the drivers heated seat button shows Hi or Lo, but won't shut off. A re-start shuts down the seat heat. 3) I can't seem to figure out how to direct air to the rear vents. The manual doesn't address it at all.
Thanks.
--
Jeff Wald
" I can handle things, I'm smart - not like everybody says - not dumb,
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They sound like po$$ible computer problems.

Should be there all the time as longs as the rear vents are open. I've never seen a control on mine.
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