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Waterless Coolant Prep Fluid

Evans prep fluid is designed to assist with the conversion to Evans waterless coolant. Prep fluid will seek out any trace amounts of water remaining in the system when it cannot be completely drained out. It is to be used a flush only, not as a stand alone coolant. It is not necessary to completely fill the system with Prep Fluid, only enough to circulate through the system.

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Manufacturer: Evans Cooling

What is the advantage of Evans waterless coolants over standard coolants? Evans coolant provides superior cooling protection through its higher boiling point and elimination of water-causing corrosion, electrolysis, and cavitation. Water based coolants require pressurized systems to raise the boiling point and provide a sufficient margin between the operating temperature and the boiling point. A 50/50 ethylene glycol antifreeze-water mix pressurized to 15psi will boil at 265°F. Evans waterless coolant boils at 375°F without any pressurization providing a very large margin and easily handling localized high metal temperatures that may occur with sustained hard use or significantly increased power outputs.

What is the life expectancy of Evans coolant? Evans coolant is a lifetime coolant meaning it does not require changing after it has been installed. This coolant does not contain the additives necessary with a water-based coolant that wear out over time. Therefore, despite the higher initial cost, over the course of the life of the vehicle Evans coolant is a more cost effective cooling option.

Are there any special considerations when installing this coolant? Yes. Any remaining water left in the system needs to be removed prior to installing the Evans coolant. Up to 3% water "contamination" is considered acceptable without adversely affecting the benefits of the waterless coolant. However, when draining the cooling system it is sometimes difficult to reduce the remaining water below a few percent of the total system capacity. Evans Prep Fluid can be used to removal much of the residual water trapped in the heater core and other areas of the system. It is suggested that 1 to 2 gallons of Prep Fluid be added to the system after draining as much of the coolant as possible. Run the engine for a short time to circulate the fluid through the system and drain it. The Evans Coolant can then be added to the system without concern of excessive water contamination.

At what temperature does Evans coolant freeze? Evans coolant will not freeze. At very low temperatures it will contract and become thick but it will never become solid and does not expand like water so cracked blocks or other damage is never a possibility even in the most extreme cold conditions. The coolant can be used in temperatures down to -40°F. Below this temperature the coolant will become too thick to circulate through the system.

I've heard this coolant should not be used in turbocharger applications, is this true? No, quite the opposite. Turbocharged applications generating high specific power outputs often suffer from localized high temperatures in and around the exhaust valve seats and guides. As temperatures exceed the boiling point of the coolant a condition called nucleate boiling occurs where vapor bubbles form on the coolant jacket surface and then break free to be replaced by liquid coolant. This nucleate boiling condition increases the heat trasfer rate and stabilizes the metal temperatures. However, in sustained severe conditions with water based coolants the metal temperatures can continue to rise to a point sufficiently above the coolant boiling point where the vapor bubbles are generated so quickly that they displace the liquid coolant and form an insulating vapor film on the surface of the metal. This allows metal temperatures to spiral out of control leading to detonation and pre-ignition. We often see detonation-induced piston, cylinder liner, or head gasket failures in otherwise perfectly tuned vehicles that are likely the result of this type of cooling system failure. With Evans coolant there is never the possibility of a loss of nucleate boiling so metal temperatures are stabilized in even the most severe conditions and there are no performance limitations created by the cooling system.