Quote:
Originally Posted by boyou2
If i remember, water is made from hydrogen AND oxygen.
What causes air in coolant system, is cavitation from the water pump, and from temperature (you know that water is boiling from about 100°C, and a little more under pressure)
as long as you have water, OR a mix of water and anti-freeze, there will be air in the cooling system  |
Cavitation and vapor from boiling water isn't air, it's water vapor. Cavitation is localized boiling when the pressure drops to a point that the boiling point drops below the current temp (Ideal gas law and all, as pressure drops, so does the boiling point). The bubbles are water vapor and as soon as the local pressure around the bubble (i.e., it's not behind the water pump blade anymore) goes back to normal, it recondenses back into water.
Separating water into hydrogen and oxygen requires electrolysis or thermolysis, neither of which are possible inside an automobile engine. Even if it did, they like each other so much, it would recombine back into water pretty quickly.