Working on a shower. Turn the handle an 1/8th turn, usually cold water should come out, but nothing. Another 1/8th turn and you can start to hear something, but water is just starting to drip out. Continue to turn and more the water starts to flow. It is just hot water, and too hot to shower in. It is a tile shower and I am afraid someone forgot to turn on the cold connection. Could it be something else? I cannot get to any of the fittings other than take off the handle and face plate. I can only imagine having to dig into the wall, but hate that idea. Any help would be much appreciated.