I have a 1997 Pontiac Grand AM. I want to know if it would beokay to clean and flush the a/c evaporator or should i replace it?

Replace. Chances Are Your Going To Want To Replace All The Parts In Your A/C Assembly As In The Compressor, Drier and Condenser Because None Of These Parts Actually Go Bad. What Happens Is Your A/C System Gets Particles Of Dirt In Them and It Goes Around The System Until One Part Breaks. Now, Replacing One Part Will Work For A Bit, But You Still Have Dirt In Your System and The New Replaced Part Will Soon Fail.