Re: Hot is cold, cold is hot
It is the 3 way valve itself [ the part above spout]
You can replace the assembly but I would check for debris build up / stuck valve. Sometimes you can disassemble it and clean it.
Click on the link and look at the picture so you'll get the idea.
Look at illustration #23 on old style and #8 on new style......
"Life does not go by the book, we learn as we go along".
You only need two tools in life - WD-40 and Duct Tape.
If it doesn't move and should, use WD-40.
If it shouldn't move and does, use the Duct Tape.