How to change belt on 2003 chevy S-10? - 2003 Chevrolet S-10

Use a 3/8 inch ratchet and rotate the tensioner (located down on the left side of the engine) counter clockwise. Use the ratchet without any socket, you will not be turning it with the bolt. As the ratchet loosens the belt, remove the belt and note how it goes over all the pulleys. Put the new belt on over all the pulleys except the pulley on the top center of the engine. Rotate the tensioner counter clockwise to allow enough slack to slip the belt on the last pulley. Check the belt and make sure it is on all the pulleys. Start the engine and make sure it is rotating correctly. It would be a good idea to remove the negative battery connection so there is little chance to shorting the system while you are working on it.