Kohler shower heads just dribble.
Two bathrooms in this 11 year old house have some kind of high end shower heads in them. There are two big fat heads at about chest level and the regular overhead showerhead. There are three rotating adjustment faucets, one is for temperature and the other two adjust volume and which of the three faucets turns on. In addition, someone has added (?) a handheld shower in each shower enclosure. I cannot get any of the three Kohler fixtures to work right. Also, the temperature regulator does not adjust the temperature. It is either very hot, or not hot, and it does not seem to make much difference how I turn it. Hot water does adjust OK in the tub and sinks which have separate hot and cold faucets. I have resorted to just using the handhelds and praying I can get in and out without freezing or scalding myself. Where do I even begin??
As far as dribble, I assume you mean that when the body spray is working you do not get as much pressure out of the rest of the heads, or something to that effect. ...»
Again not uncommon, Water pressure and volume is the key here. If the pipe that extends from the main and hot water heater is less then 3/4 inch and your water pressure in the house is low its simply not going to work as you would like.
I would suggest that you have a plumber if your not familiar with how to change the mixing valve cartridge and while they are there have them check the pipe sizes to determine why your shower heads do not produce proper spray pressure.
As as Jason said, it could be just plain hardness in the faucet itself.
I assume it is OK -- still have to take my morning shower : ).