How do you replace an ac belt on 2000 chevy pickup?

u need to remove the other belt then u need to put the ac belt on behind the pulleys then move the tensioner and put on the ac belt u need to do this from under the truck u will need a 3/8 ratchet u need to remove the other belt then u need to put the ac belt on behind the pulleys then move the tensioner and put on the ac belt u need to do this from under the truck u will need a 3/8 ratchet