cooling system flush - Help!!!-
I want to flush the coolant system in the stang becuase it has 72,000 on it and has never had one to my knowledge. I am confused though. Haynes repair manual says to take out the drain plugs in the block as well as the one on the radiator. Is this necessary? Also, I bought radiator flush to put in as well, is this safe?? What is the best way to make sure I am getting the right 50/50 mix of antifreeze/water?? Any help would be appreciated, I don't want to break anything and I've never done this before. Thanks!