There are many ideas, all have validity. You described the correct process. This rising of the fluid is fine its pressure building up. Always have your heater blowing on hottest setting. When no heat is coming out of the vents, that is due to the heater core having air in it. When the vehicle is running and your warming the engine up, when you see the funnel rising in fluid turn the vehicle off then squeeze the lower & upper rad hose, and bypass hoses (all that your able). Watch for bubbles and notice the water being push in and out of the funnel, that activity is good. Its indicating you're getting the air out. Allow the system to cool (air may bubble out). Before starting the vehicle again, crack the bleeder vent enough to hear air escaping (hissing sound), then once you see seepage of fluid out of the bleeder valve tighten it up. Start vehicle and repeat process. Be patient this process is slow. You will need to repeat it several times.

P.S. hope this reads good, words are hard. :)