I would appreciate ANY help with this issue. Water in sinks and downstairs shower all get plenty hot. The shower/tub water upstairs barely gets lukewarm. We have an American Standard thermostatic valve trim kit installed. I have tried using the installation instructions to adjust the tempurature but nothing changes. It has been this way since this new bathroom was installed and I am SO tired of taking cold showers. If someone could walk me through the adjustment I would be forever grateful.