All I can add, is much easier to find it in the vehicle than looking in the shop manual, usually on the left tank of the radiator on the engine side, just a plastic plug. Be careful when removing it, just want to remove it, not break it, keep on telling myself this stuff.
Also getting darn near impossible to get at the block drain plugs, who decided to put these in the transaxle side? Only an inch of clearance, not about to remove the transaxle first. So I jury rig my leaf blower with a hose duct taped and pray I can blow most of it out. In my neck of the woods, should be using a 60-40 mix, and what idiot came out with a 50-50 premix? Really have to search for the real stuff.
454 in my motorhome is the same way, put the drain plugs right behind the motormounts, least on my 305 on my boat, I can barely reach them, if I don't remove those, will have a cracked block the next spring. Ha, was on a boating site where people didn't know this, wasn't on that site very long.
Ha, back in the 50's with only alcohol anti-freeze available at six bucks a gallon, would drain my block every night. Get up early in the morning a put a pot of water on he range to heat up the water so the darn thing would start. Spent my breaks running the engine so it wouldn't freeze up.
Ha, should have purchased a VW bug with an air cooled engine, but 50 mph wasn't fast enough for me. Just saying, this is an age old problem.
Been a long time since I have seen a cooling system bleeder, was on a 80's Honda.
The problem is that the fill point for the coolant has to be the highest point, and in some vehicles, the heater core is higher than this fill point. Even my motorhome was this way, got around this by jacking up the front so the radiator cap was the highest point, and gravity took care of the rest.
Was solved on my Cavalier and Cruze by adding that reservoir at the highest point on the firewall. Just filll it to the top, run the engine and wait for the thermostat to open, keep on filling it again. Drive it a day or two, reservoir will be low, but the cooling system will be full, so top it off again when cold.
One reason why practically every new Cruze had low coolant after a couple of days, didn't drive it around, only took Chevy a couple of years to figure this out.