I have a 1997 cavalier. If it is the same and I think they are. The best thing to do is go to Wal-mart and get the installation kit. Inside the kit are directions on how to get the old stereo out. Because you have to take the dash off to get to some of the screws. It sounds rough but really it is easy.
try www.haynes.com
Yes
Remove the head and replace the gasket. No other way to fix it.
yes
yes
2.2L Altenator on a 2.2L, AND, 2.4L on a 2.4L ONLY!
no i can not answer this quiestion
take the plastic cover guard off and it is 2 bolts right on top take them out and it is free
Here is a link with pictures, tools needed and everything to do the job. http://www.v6z24.com/howto/heatercore
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.
Auto or standard?
4x6 inch