I attached the directions below for replacing the pump. If you are getting coolant from behind the pulley, chances are it is coming from the weep hole and the pump needs to be replaced.
As far as the belt is concerned, it is absolutely in a strange place. It has a tensioner just like the serpentine belt at the front of the engine. I attached two pics below showing the tensioner and the belt. The tensioner turns the same as any tensioner. Once it's turned, you will be able to remove the belt. See the last two pics.
Let me know if this helps or if you have other questions.
See pics below.
Images (Click to enlarge)
Tuesday, November 22nd, 2022 AT 9:42 PM