Product Spotlight: Evans Cooling Systems

Evans HD coolant can increase the service life of all of the cooling system components, eliminate in-field top-off, eradicate cylinder liner cavitation along with electrolysis. It can help improve power and fuel economy by lowering the combustion chamber temperature of the cylinder head.


With the rapidly evolving technology on the farm and ranch, you probably wouldn’t be surprised to find advancements have even been made in engine coolants.

Evans Cooling Systems has created a unique engine coolant product that does not employ any water at all. This eliminates issues that traditional coolant of any color can bring to an engine.  Evans HD coolant is a waterless formulation of glycols that never freezes and does not boil until 375 degrees F.

Not new to diesel and high-performance engines 

Evans Cooling Systems Inc. produces two distinct and dedicated chemistries. HPC (High Performance Coolant) and HD (Heavy Duty) are specially formulated for gasoline and light-duty diesel engines and heavy-duty diesel engines, respectively. Though they both share the same basic formulation each is blended specifically with the necessary chemistry for their use. 

  Though new to the agricultural community, Evans waterless technology has been used extensively by long-haul trucking fleets, mining equipment, marine engines,  methane gas powered generator sets, stationary engines along with a myriad of racing and severe- duty applications for more than twenty years; uses that share the same needs as the liquid- cooled engine employed in farm machinery.

To understand the basic theory of the Evans waterless coolants, there is a need to look at how heat transfer in an engine occurs. When studied it quickly is realized that the job of the liquid is to cool the engine and the task of the radiator is to cool the liquid. This is often looked at the wrong way–the radiator does not cool the engine. It drops the temperature of the coolant so that it can go back into the engine and pull heat out the cylinder head and then the block.  

Engines overheat and spit out coolant when the liquid cannot absorb any more BTU of heat, and the radiator cannot drop the temperature sufficiently to let the liquid do its job. The deficiency of traditional water-based coolant now becomes apparent.  

When an engine is under load nucleate boiling occurs in the cylinder head, this illustration is how heat is removed. The Evans technology refrains from boiling until almost 400 degrees F, thus removing more heat from the combustion region.


The Evans technology has the ability to absorb almost 140 degrees F more heat from the engine than 50/50 EG and water. Additionally, the Evans products are more slippery inside the engine. This is read in chemistry as surface tension and the metric used is dynes/centimeter. By releasing in the cylinder head easier, the Evans HD and HPC reduce system operating pressure which puts substantially less strain on hoses, seals, gaskets, the radiator and heater core. The vapor pressure of the HD and HPC are much lower, further reducing system strain. 

By eliminating water, system corrosion, degradation, liner cavitation and electrolysis is no longer a concern and there is no need to dose the coolant with an SCA as traditional anti-freeze requires. Also, an important fact during heavy loaded field work far from the shop, the coolant will not become consumed as water-based products do. You don’t have to be concerned with carrying a supply of coolant on the machine or service truck for top-off. This is especially critical during harvest when a combine’s radiator is covered in chaff and the engine is working hard in hot weather for long periods of time. 

There is a caveat to all of the benefits of the Evans HPC and HD coolant–it cannot be mixed with traditional anti-freeze. The entire cooling system needs to be emptied via the block drain. The radiator and heater core then needs to be blown out. After this is done, the Evans waterless technology can simply be poured in. Evans offers a Prep Fluid that wicks in the water-based coolant to make this task more efficient. With a new or rebuilt engine it is a direct pour in with no other effort.  

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