How to tighten or loosen the serpentine belt in a 1995 Chevy cavalier z24?

I just replaced the serpentine belt on my 1999 cavalier Z24 today. There is a tention pully that constantly pushes on the belt to keep it tight. There is a bolt head in the middle of this pully. Normally it's 15mm. You'll need an open end wrench to put on the bolt head. Put it on and turn it counter clockwise. You'll feel the entire pully move and you will see your belt loosen. It's not a good idea to let go of the pully. Try to keep pressure on it till you get the new belt in place. Like I said I have a 99 Cavy there may be some differences but it should go about the same for you.