My guess is that when you take off the doghouse cover you will see the back of the a/c compressor, unless you cut or saw under the area of the tv you will not be able to reach the water pump. Mine doesn't have a removeable shelf, probably should have put one in when I was changing the tv to flatscreen. It still might be easier than removing a/c radiator, fan and then the radiator doing it all by way of the front opening. I still don't know how the a/c mechanics that replaced the serpentine belt were able to do it, maybe they discovered a way of removing the bottom shelf or had thinner arms than mine, must not have been too hard or they would have charged for it
They had the old belt out when they replaced the compressor. Take some pictures if they find the atternate way of getting to the water pump, looks like another place I will have to watch for leaks. How did you determine it was water pump? mine was leaking antifreeze after climbing a couple of mountains, but it was just the hose connections above the radiator, leaking when hot and stressed.