Leave the radiator cap off, cover the grille with cardboard. Start the engine, turn the heater on high. Tach the engine to 2000 RPMs and hold it there. Let it run like that until it gets hot enough for the thermostat to open up. Personally, I just use a vacuum refiller when doing coolant flushes, but they are very expensive.
Locate the plug on the bottom of the radiator to drain it. Put some radiator cleaner in and drain it again.
Remove coolant cap, allow engine to get to operating temperature, turn on heater full blast and patiently wait for air to escape system.
If this is for an S-Series, you don't have to, The system has a deairiation line and does it on its own.
pop the radiater cap off and let the van engine run for 30 minutes. this will burp out any air in the cooling system and your engine will not overheat then. afterwards, fill the radiater back up as needed.
There is a screw right on top of the line about in the center of the engine (maybe a bit to the right as you are looking at it). Loosen it and let the air out, when fluid starts to come out, tighten it back.
You need to burp the radiator and cooling system.
It should have a bleeder screw on top of the thermostat housing.
The cooling system on a 2001 Mitsubishi Eclipse GT can be burped by gently squeezing the upper radiator hose. Keep topping the overflow tank until the air is purged.
burp the water system that may help
You carefully remove the top coolant hose to the heater, not totally off, just enough so air can get out.
you need to burp the cooling system
The mechanic at the shop indicated that there was no bleed screw on the 200 Ford Explorer. This problem was resolved by starting the car (not driving it) and allowing it to run a little. The machanic did advise us to not allow the car to overheat.