My upstairs shower has 110 degree hot water . The sink 5 ft away has 130 degee water they come up in the same pipe split in the wall. I have changed the diverter with a new one and the same results all the other water is at 130 degrees any ideas

Likely because the Shower has an antiscauld feature built into it. Or if its adjustible like the one I have its maladjusted.

sirius50 does not find this helpful : i took the shower head off still 110 it was hotter a short time ago

Sirius50 Try reading the site rules BEFORE you improperly give a Not Helpful or a disagree. Nothiong I said was inacurrate.

Try reading my post again... I never said Anything about the shower head.