In one of my showers I have never had any hot water pressur. It's a single handle and the cold water works great but when I turn it to hot the pressur isn't enough to take a shower. I changed the water changer thinking it might be stopped up but it didn't help. Could it be the hot water line going to it. Our kitchen sink and two batroom all run the length of one wall in the house and this shower is the last in the line.
Thanks,
Clint

Tell me exactly what you mean by " I changed the water changer " This issue is likely just a clogged hot inlet on the cartridge.

Is it a moen valve? If so you will need to change the cartridge.

Most valves, including Moen, can be cleared without replacement, even though they are warrantied for life. Chaywood needs to tell us what was done and how long has the problem existed

I changed the insert that the knob screws into to turn it from hot to cold. Also this problem has existed since I bought the place 10 years ago.

"insert" we are going to assume you mean cartridge but a brand, model, picture would all be helpful.

Looks like the problem is solved. I took the cartridge out and the spout off then turned the water back on for a few seconds and what ever was causing the blockage is gone. My shower is working wonderful.
Thanks for your quick responses to my problem.

OK insert was catridge like we assumed. Glad you are up and going.