Power windows and seats not working, car won't start

Those are all really common symptoms of the alternator going bad on those cars. I would have it checked to make sure it's charging properly.

I would expect to find a main wiring connector has some serious corrosion in it.
The fuses for those circuits would be in the fuse box in the engine compartment.
You could try running power direct to the driver's door switch to make the windows come down. Make sure you have a fuse or breaker in the line.

Take it back to the dealer .

Your first problem is to find out why the intermittent no-power problem. Honestly, that sounds like a loose conmnection somewhere. check all your grounds for clean and tight conditions Also, battery connections and alternator connections. Double check your power distribution center for any loose wires or poor connections. Once you solve that problem, then you can diagnose the other problems with poor idle and temp. gauge.

Could be any number of items related to the seat
power motor circuit

Start by removing & testing the switches

If modules are involved,then it will be beyond
your ability to diagnose ,without a trouble chart

Check any fuses that apply

If a fuse is blown,replacing it won't
likely fix the issue,only blow again

Use a test light to check all the fuses, including the master inline fuse.

crank sensor?

i don't have a solution but my car did the same thing in october 2009 and i still have not had it repaired. I am told it is something electrical because its your fuel pump is not coming on and that is why the car is not starting but it doesnt make since why the windows and power seats dont work. I have also been told the only thing that connects the 3 of them is the body control module.

check fuses