Heater core

Bleeding is not an issue with the old stuff like this new stuff we drive. Just pour some water in the heater hose to fill the heater core...put the hose on and leave the cap off and fill as needed. My Ram you have is a PIA to get the air lock out but the old things that we love are not as big an issue. At least not to my observation.
the easiest way is just jack the front of the car up where the rad. cap is the highest point. with everything hooked up like normal, open the heat where it will circulate and fill it, engine running of course. hotrodders that have the the rad. cap lower than the engine have been doing this for yrs. had to do it that way on my 406 vega everytime I filled it.--bob