Shower mixing valve problem??

I have a shower stall with a single control knob that controls on\\off (pull out for cold and push in for off) and hot\\cold (left for hot, right for cold). The temperature setting on the gas-fired water heater is on the "normal" setting. Other faucets in the house seem to produce a lot hotter water when they run with only hot turned on. For a year or two now I've had to keep the combination hot\\cold on\\off handle almost all the way towards hot to keep the shower hot enough for a decent shower. I finally removed the round knob and the escutcheon plate to see what it looked like. There's a very small retangular cutout in the tile and the only thing that's visible are the two holes that mount the escutcheon plate. The diameter of the place where the knob mounts is a little bigger than the diameter of a nickel, and it appears to have what looks like the same type of fitting as with a garden hose valve when you remove the wheel handle - it looks simply an on\\off function - I didn't seen anything that looks like other mixing valves that I've seen in pictures - nothing that looks like any adjustment screws or the like.
Is this a situation where I simple remove and replace what the control knob attaches to? When I go looking for replacement parts, what's the proper terminology?
If it's going to involve removing tile and all that, I can learn to live with it.
Thanks!
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On May 25, 10:36 am, "Whatever . ."

Most fixture maker's customer service people will be able to supply parts/installation diagrams. Start there to judge how to approach the project. Depending on what you find, check out Harbor Freight for diamond drills or hole saws you may need to open up the tiled area to access a control mechanism. Good luck.
Joe
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wrote:

Most fixture maker's customer service people will be able to supply parts/installation diagrams. Start there to judge how to approach the project. Depending on what you find, check out Harbor Freight for diamond drills or hole saws you may need to open up the tiled area to access a control mechanism. Good luck.
Joe
Unfortunately, there's no indication that I can see as far as the manufacturer - the *&%2# that owned the house before me made the access area so damm small . . .
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*On my Kohler there is an adjustment on the right and on the left for each water input. Opening and closing each one determines the water temp. I expect that you have the same, but since the opening is so small you cannot see them. You could try a RotoZip with a tile cutting bit to open it up more.
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On the 2 Kohler different mixing valves I installed, the "adjustments" you refer to on the left and right are merely shut-off valves, and are not used for setting water temperature. Perhaps your Kohler valves work differently.
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On May 25, 10:36 am, "Whatever . ."

I had that issue, it was some large grit blocking the HW, but mine had a plastic cartrige that came off easily.
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Kohler mixing valves have an anti-scalding limit adjustment which restricts hot temperature settongs. If set wrong it prevents truly hot water from being discharged.
Smarty
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