Originally Posted by
dinasrt
Woody,
After reading your results, I'm now wondering how much small amount of pressure builds up w/ my separated system w/ the pin hole vent on the cap of the power steering tank that I'm using as a reservoir. Even w/ the tiny vent hole in the cap, doesn't the pressure build up a few pounds when the coolant comes up to max temp. after a hot lap? Otherwise, I wonder if I could find a low pressure cap(5 or 6psig)that would fit the reservoir, and if the little tank is strong enough to hold the added pressure. I'm thinking about teeing in a low pressure gauge(1-10psig), and popping the hood after the lap to have a look see. Because the car is never subjected to a freeze, I'm running distilled water, water wetter, and a little wtr. pump lube per your recommendation; so I'm concerned about this "localized boiling" that you speak of. Perhaps I need to go back to the antifreeze mixture for better protection against this?
Just plug the little hole in the cap and see if the iat goes down.