Here is a link with pictures, tools needed and everything to do the job. http://www.v6z24.com/howto/heatercore
Yes
A Haynes or chiltons manual has the how to. Or do a search for a forum for Chevy corsica specific
Remove the head and replace the gasket. No other way to fix it.
yes
the library should have a shop manual to make copies of for your vehicle...:)
pay me $75. lmuller2@ivytech.edu
yes
You dont. You just have to remove the glove box insert.
Possible leak in gas line. Must be some sort of air leak in the heater box under the hood. Heater is pulling fumes into car through the leak in it.
2.2L Altenator on a 2.2L, AND, 2.4L on a 2.4L ONLY!
no i can not answer this quiestion
You are going to have to determine which ball bearings before you can get a price to replace them. Sorry I can't be more help.