no heat, out of heater only cold

What is your question?

ive replace heater core, blend doors and actuator motors and still get only cold air, with a/c disconnected still blows cold. I have 125 degrees going into the heater core and 115 returning back to engine.

What makes this problem better or worse?

at all times

How long has your 2010 Dodge Ram 2500 had this problem?

over a year