I have the same problem as several others. It is always best to Start from the beginning. The shower head was leaking: I replaced the valve stem assy, essy-peasy, installed the same as the old one. The handle travels appx. 150 degrees counter clockwise. I have read the forums such as this one. At one point I was getting reversed hot & cold water. I read where I should turn the valve stem 180 degrees, this did not work either It reversed the direction the handle travels. I got a cartridge 974-042 that was no better. Today reinstalled new oem parts as originally installed and no hot water.
Rotate cartridge, not the valve stem
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Off topic, but please don't delete. As we are all cooped up and are hovering here at SE like a helicopter parent at wresting match, hoping to see a question and get points for! Please somebody ask questions I can quickly answer and upvote my answer....before I go stark raving mad! REDRUM REDRUM REDRUM (hint: The Shining). LOL!!!! Ack! you have mentioned you are in Seattle, I'm down here in Olympia, putting up with the intermittent gray weather / rain too. BTW, I love your "Bill the Cat" image! – George Anderson Mar 31 '20 at 22:03
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If I rotate the cartridge the valve stem rotates also, it is all one piece, it can only work 2 ways , either one is just 180 degrees from the other. I wish I could post pic's. maybe I can, just don't know how – wilbo9619 Apr 2 '20 at 23:24
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Does it change the hot / cold though? If so, your original question is addressed. Then to deal with the handle. Can you just undo the handle reattach 180? – Ack Apr 2 '20 at 23:34
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1Oh answer to your question yes I do get hot and cold the clod comes out when the hot is suppose to and vice versa I posted this question to Pfister, they refered me to a YouTube video, it is so simple 5 screws including the one that tightens the handle, if I follow their video and I have. The handle is on the wrong side and I get only cold water. The water mixer is part of the handle stem – wilbo9619 Apr 3 '20 at 23:34