Today while sitting parked in my FIL's van, the one I just put a new thermostat in, but failed to really test to see if it would overheat? A couple miles down the road, it pegs the temp guage. I put the OEM of 192* instead of 160* because it wasnt passing smog, they said the computer this/that. So anyhow I had time to sit and think about car cooling systems, and it brings this question, I recall an electricity experiment in Chemistry class where a pyrex jar of water, a light bulb, and electricity, the water makes the connection but no light. Add salt and it conducts and the light comes on. (but People get shocked instantly because of something on the skin) but distilled water wont conduct that well. Okay, if salt makes the water a better CONDUCTOR, and the idea is to conduct heat, because its a heat exchanger, could adding salt increase the efficiency of the water and make it cool better because it appears to increase the waters conductivity? The salt will do what I suppose ocean water does to marine craft, but then dont they use the (salt) water to help cool the engine?