![]() With no water to boil off, localized hot spots and mineral deposits are avoided. It doesn’t need a 15-psi radiator cap - the manufacturer recommends 1 to 2 psi, just enough to close the system. Water carries scale-forming minerals, so waterless coolant prevents scale buildup. Waterless coolant, however, won’t freeze below 40° F and boils at above 375° - even without pressurization - giving a huge safety margin. With the pressure cap, water boils at 250° and 50/50 coolant boils at 263°. Additional margin is provided by pressurizing the closed cooling system to 1 atmosphere (15 psi) above ambient. Since engines operate at close to water’s boiling point, the glycol adds a safety margin to prevent boil-over. It also raises the boiling point to 224°. Traditional, fully formulated coolants prevent freezing to -34° F. This can occur even in pockets within the engine, even though the coolant is at normal operating tempeatures. When it boils at 212° F, it creates vapor pockets that can insulate and hold heat in the metal rather than transferring heat away. Water is an excellent heat-transfer medium when liquid, but it changes state. How does Evans compare to water or water and antifreeze in heat transfer efficiency? Reply Water is a very efficient fluid for heat transfer. This is a low pressure purge, so perhaps a small portable tire inflation compressor could get the job done. You don’t want to be draining your system with the engine running, nor would I trust the prep fluid alone to eliminate all of the water in the heater core. If I don’t have a compressor, could I run the engine up to temp, turn on the heater, and flush out the heater core that way? (My car has A/C.) Thanks! Reply Hello! This looks awesome for my ’72 Pontiac, especially since I just got my radiator re-cored. We would like to offer you a special promotion for your first year membership. We are convinced you will enjoy the benefits of becoming a member and having access to the best instructional how to videos and professional tips. We’d love to have you be a part of our community. I would think that this product would a good alternative… higher boiling point, lower freezing point and no corrosion in a product designed for low and no pressure situations. They have non pressurized cooling systems, would this product provide any real benefit for these systems? Reply ![]() I have two antique cars made in 1929 & 1931. Δ 8 Responses to “Evans Waterless Coolant Upgrade” Mail (required) (will not be published). ![]()
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