Stuck in traffic 340 got up to 220
Wellllll, that is at sea level standard atmospheric conditions. As you go up in altitude there is less weight of air or atmospheric pressure on the water, so it boils at a lower temperature. If you put water in a jam jar with a bit of tube soldered into the lid and put vaccum on it, you can get it to boil at room temperature.
Water is the best heat transfer medium, but freeze protection and increased boiling point are of great benefit. Different chemicals used for antifreeze or heat transfer have different freeze and boiling points. 50/50 mix with water gives the best overall performance. Here on the Canadian prairies where I have experienced -50°C or about -60°F, or in the Arctic where -70°F is possible, 70% ethylene glycol antifreeze is adviseable. This is the maximum freeze protection as after that it can get to "jelling" where it just gets like jelly and will not move through the heater core or radiator. The engine can overheat but the jell in the rad core will not move.
