with the heat on high, engine on, and revving several times, have to have the bleeder screw partially screwed on because if i don't the coolant spills out like a volcano. the bubbles did not stop even after an hour.
This post would get more responses if you put it in the General Discussion category, hardly anyone looks in this section
Also state the year of the truck
Are you just trying to get the Air out of the radiator, hoses & heater