When I pull the shower diverter in our bathroom it makes a very loud squealing sound. It only makes this sound on hot water settings... turning back to cold water stops the sound. It takes a about 5 seconds for the water to come out of the shower head and the squealing continues while hot water comes out. We have a single knob for water temperature and the diverter is in the tub spigot. I soaked the shower head in CLR and it has not helped the issue. I tried the diverter with the shower head completely removed from the pipe and still get the noise. Any help would be appreciated.