what good does it do to bleed the air from your system (from the radiator, correct?) how often should you do it? how do you do it?

 

air bleed your brakes?

if you are talking about brakes, air bleed em and flush out old fluid every 2 years or so

 

not too sure... people always talk about "bleeding air" ... what else can be bled ? and how would you do it?

 

It's usually only a problem when you drain and refill your cooling system. Because the radiator in the 3rd Gen is tilted at such a severe angle, it can be difficult to get all the air bubles out.
After the coolant has been replaced, run the engine to allow the coolant to circulate. Then stop the engine and take the cap off the filler neck. (not off the AST. The filler cap is the one on your left as you face into the engine bay. It has a yellow label.) You will probably notice that the coolant level has dropped down the filler neck. Fill with water until it covers the little hole in the neck. Turn the engine on again. Recheck the coolant level and repeat this process as many times as necessary until the coolant level reaches to a point just below the little hole in the filler neck.