One thing you could do is pull the thermostat. This valve shuts off the supply to the radiator, and will leave the block full.
This is why the back-flush kit is so popular.
This kit is made by Prestone, and you should find it easily at an auto parts store. It splices into the heater line. EASY
I don't recommend you run straight coolant though, unless it is super cold. Follow the directions on the bottle, as this coolant is a concentrate and is meant to be dilluted.
Normal usage is 50/50, and this is where it cools well.
BTW, straight water is the most effecient coolant, but has no lubricant for the water pump. There used to be a lube you could buy, but haven't seen it in a while.
If you are overheating, it is not a problem with your coolant, but something else, like not having your aux fan come on.
Personally, I use the newer orange coolant!
