Originally Posted by jmburton1993
Have you just flushed the heater core itself? I had similar problems and disconnected the hoses from the engine to just flush the core did the trick
I did that on my old truck. I had no heat at all. Unhooked the hoses from the motor and used a garden hose to flush them. Had to keep reversing the direction until it flowed clear both ways. Had good heat afterwards.