Welcome to Just Answer, I will do my best to help with your problem
You probably need to replace the cartridge
How difficult is it to replace the cartridge?
Not too difficult if it's an older Moen but you may need to buy a cartridge puller
Is there a model # anywhere on the handle that I can use to go buy a cartridge?
Is this a tub/shower valve/faucet or a sink faucet? No point in buying the cartridge until you know if you need the puller too
This is a sink faucet.
here's a link to the Moen website with step by step instrutions
Thanks for the very helpful info...I'll check out the website.
You're welcomeThanks for using Just Answer
I would appreciate an accept