Help with shower temperature adjustment

[khrys]

Hello, I just moved into a new place and the water is hot everywhere except one shower. I identified it as a Moen Posi-Temp(I think... it is a full flow, only twists to control hot/cold, does not pull in/out). I disassembled the faucet head.... but I do not see the regulator I expected to see and adjust. When I remove the decorative (tear drop shaped) cover and handle, and then pull off the sleeve, this is all there is. How/where is the temperature adjustment for this or am I simply mistaken? Thank you so much for any help you can provide.

 

[TJRAD]

from the off position: turning counter clockwise will change temperature from cold to lukewarm to hot. If when doing this and you feel no temperature change then I suspect the cartridge and its built in pressure balance spool is frozen. Replace Cartridge.
Moen posi temp cartridge #1222b

 

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[khrys]

Thank you so much! There is a change, but the water is just not nearly as hot as it is at every other spigot in the house. I will try changing the cartridge. Thank you again!