More heater help

In a different post I highjacked, I was experiencing heater issues. To catch everyone up on the issue, my heat is blowing cold air and the jeep is not over heating. I read it could be casting sand clogging up the core. I backflushed the system and both hoses are hot/warm and still no heat. Is it going to be something behind the dash now?

Some how my heat started working again last night. I have no clue as to why.

Having same issues with my 13 now. I have auto climate control and no matter what temp setting I have it on I only get cold air. Have a feeling it's the climate control module or switch that went bad. Anyone else have this issue and figure out what it is.