How do you change the belt tensioner in a 1987 chevy celebrity?

I was told that I'd have to drain my coolant before I did anything, is that true?How do you change the belt tensioner in a 1987 chevy celebrity?Check out the free repair manuals at autozone.comHow do you change the belt tensioner in a 1987 chevy celebrity?Go to a parts store and get yourself a repair manual and do some reading up on it.it will have all the information you need in it.