Water is fine when full hot or cold, but starts to pulsate when warm water is selected. I have a single American standard shower fixture
Thank you for asking your question on Just Answer. The problem you are experiencing is normally caused by a defective cartridge in the fixture. Most American Standard fixtures come with a lifetime warrenty and they will send you nay part needed to repair the fixture free of charge. You can call American Standard customer service for instructions on obtaining the free parts.
Call: 1-800-442-1902Monday through Friday8:00 A.M. to 5:00 P.M. EST
If you wish to but the cartridge and replace it yourself, the video below shows how.
Click here if you cannot view the video.
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Handyman, Master Gardener