Bleed off some freon until you have the right numbers. This should be done by a qualified ac mechanic with equipment to reclaim the freon.
Remove the head and replace the gasket. No other way to fix it.
change out your wheel cylinders..
first check to see if your getting spark, or fuel
Take it to the garage.
Please take it to a licensed facility for evacuation and recharging. You could do damage to your system if run that way and damage to the atmosphere if you release the gas manually.
I dont know how to do this
Usually not repairable, you will have to replace the complete multifunction switch.
you can be foolish and go the cheep way by putting a in line resistor to limit the current but id replace the batt defiantly cuz overcharged batt can explode but my recomedation is buy a used alternator from a junk yard or a new alternator.
Replace the high speed relay.
Fixing the rocker panels on a 1995 Chevy Corsica will not compromise the frame. Fixing this will help the vehicle last longer as far as rust goes.
take apart the dash, and reset it to park when the car is in park.
Unless you supply more information with your problem, the best fix I can offer is to buy a new one from Auto Zone, or Advance Auto.