What type of AC coolant does a 2002 grand prix take?

50% distilled water, (less corrosive water), and 50% Dex Cool coolant (made by several different manufacturers). I use an old milk jug and mix 1/2 gallon water and 1/2 gallon Dex Cool to fill as needed.

I also recommend flushing a cooling system which uses Dex Cool every 2.5 years, or 40,000 miles (whichever happens first).