Evans Waterless Coolant and the Critical Role of Refractometer Testing

Modern engines operate hotter, harder, and under more demanding conditions than ever before. High-performance vehicles, turbocharged engines, diesel trucks, off-road equipment, fleet vehicles, agricultural machinery, and classic cars all place tremendous stress on cooling systems. Traditional water-based antifreeze mixtures have served the automotive world for decades, but they also introduce several limitations that can compromise long-term reliability and thermal performance.

That is why many automotive enthusiasts, fleet operators, racers, and heavy equipment owners are turning to Evans Waterless Coolant as a superior alternative to conventional coolant systems.

Unlike traditional antifreeze mixtures that rely heavily on water, Evans Waterless Coolant is engineered to operate with virtually no water present in the cooling system. This fundamentally changes how the cooling system behaves and dramatically reduces many of the problems associated with conventional coolant.

However, there is one extremely important requirement for Evans coolant to work properly:

Water contamination must remain under control.

This is why a refractometer is not optional — it is an essential maintenance tool.

The NI Supply Evans Waterless Coolant Refractometer allows users to accurately verify coolant concentration, detect contamination, and ensure the cooling system continues performing exactly as Evans intended.

What Makes Evans Waterless Coolant Different?

Traditional coolant systems typically use a 50/50 mixture of water and antifreeze. While water transfers heat efficiently, it also creates several well-known problems inside cooling systems, including:

• Corrosion
• Electrolysis
• Scale buildup
• Cavitation erosion
• Steam formation
• Pressure buildup
• Boil-over conditions

Evans Waterless Coolant eliminates these issues by removing water from the equation almost entirely.

Because the coolant contains little to no water, it offers several major advantages over conventional antifreeze systems:

• Extremely high boiling point
• Reduced cooling system pressure
• Improved cavitation resistance
• Reduced corrosion
• Longer coolant life
• Reduced vapor formation
• Better thermal stability

According to Evans Cooling Systems Technical Information, Evans coolant has a boiling point of approximately 375°F at atmospheric pressure.

That high boiling point dramatically reduces steam formation and hot spots that commonly occur in water-based systems.

Why Water Content Matters So Much

The entire Evans coolant system depends on maintaining extremely low water content.

Evans recommends keeping water contamination below approximately 3% for optimal performance. Once water levels begin rising, many of the coolant’s benefits start declining.

Even small amounts of water contamination can:

• Lower boiling point
• Increase vapor formation
• Increase cooling system pressure
• Reduce cavitation resistance
• Increase corrosion risks
• Reduce coolant lifespan

Water contamination commonly occurs from:

• Residual water left behind during coolant conversion
• Accidental topping off with water
• Mixing with conventional antifreeze
• Atmospheric moisture absorption
• Incomplete flushing procedures

Unfortunately, water contamination cannot be identified visually.

That is where refractometer testing becomes critical.

Why a Refractometer Is Essential

A refractometer measures the refractive index of the coolant. As water concentration changes, the refractive index changes as well.

The Evans coolant refractometer converts these refractive changes into Brix readings that correlate directly to water contamination percentage.

This allows technicians and vehicle owners to verify:

• Proper coolant conversion
• Ongoing coolant purity
• Water contamination levels
• Cooling system condition
• Long-term coolant performance

Without refractometer testing, operators may unknowingly lose many of the advantages they invested in when converting to Evans coolant.

Why the NI Supply Refractometer Is Ideal for Evans Coolant

The NI Supply Evans Waterless Coolant Refractometer is specifically designed for monitoring Evans Waterless Coolant systems.

It offers:

• Fast field measurements
• Portable operation
• Simple interpretation
• Reliable repeatability
• Evans-specific Brix scale
• Rugged construction
• Automatic Temperature Compensation (ATC)

This makes it ideal for:

• Automotive repair shops
• Racing teams
• Diesel service centers
• Fleet maintenance departments
• Heavy equipment operators
• Classic car owners
• DIY enthusiasts

Automatic Temperature Compensation (ATC)

One of the most important features of the NI Supply refractometer is Automatic Temperature Compensation.

Models with the “ATC” suffix are equipped with “Automatic Temperature Compensation” for accurate measurements without re-calibration after shifts in ambient working temperature (field use). This unit does have ATC and the range is 50-86°F / 10-30°C.

Because refractive index naturally changes with temperature, ATC improves measurement consistency when working in varying environmental conditions.

This is especially valuable in:

• Garages
• Race pits
• Field service environments
• Outdoor maintenance applications
• Industrial facilities

ATC helps ensure accurate readings without constant recalibration due solely to ambient temperature fluctuations.

Why Samples Must Cool Before Testing

Even with ATC, coolant samples should briefly cool before testing.

Samples must cool off for a period of seconds (depending on fluid viscosity) before using the instrument.

Micro-climates can be created for a short while, causing some results to be inaccurate. Waiting a few seconds to allow samples to cool — much like allowing a spoonful of hot soup to settle — yields stable and reliable results.

Testing hot coolant immediately after engine shutdown may produce unstable readings.

Allowing the sample to stabilize helps improve:

• Reading consistency
• Boundary sharpness
• Repeatability
• Accuracy

How to Calibrate the Refractometer

Proper calibration is critical for reliable measurements.

Because refractive readings are temperature sensitive, Evans recommends calibrating the refractometer before each use.

Step 1: Clean the Prism

Always clean the glass and daylight plate with a soft, lint-free cloth.

Do not:

• Submerge the refractometer
• Rinse under running water
• Use abrasive cleaners

Clean optics are essential for accurate readings.

Step 2: Apply Fresh Evans Coolant

Place a drop of new Evans Waterless Coolant directly onto the prism surface.

Fresh coolant serves as the calibration standard.

Step 3: Close the Daylight Plate

Close the plate gently to spread the sample evenly across the prism.

Avoid bubbles or dry spots.

Step 4: Adjust Calibration Screw

Using the small screwdriver supplied with the refractometer:

• Turn the calibration screw slowly
• Observe the blue/white boundary line
• Adjust until the boundary intersects exactly at 57.0 Brix

This establishes the correct reference point for pure Evans coolant.

How to Test Evans Waterless Coolant

After calibration, testing is fast and straightforward.

Step 1: Obtain a Representative Sample

Collect coolant from a location where fluid is circulating and well mixed.

Possible locations include:

• Radiator drains
• Overflow tanks
• Service ports
• Expansion reservoirs

Step 2: Allow Sample to Cool Briefly

Wait several seconds to stabilize the sample temperature.

Step 3: Apply Sample to Prism

Place several drops onto the prism surface.

Ensure full coverage.

Step 4: Close the Daylight Plate

Close the plate carefully to spread the sample evenly.

Step 5: Read the Scale

Hold the refractometer toward a bright light source.

The boundary line between the blue and white fields indicates the Brix reading.

Evans Waterless Coolant Brix Conversion Chart

Understanding the Results

Ideal Range — 55.7 Brix

A reading near 55.7 Brix corresponds to approximately 3% water contamination.

This is considered ideal and provides:

• Maximum boiling protection
• Low vapor formation
• Excellent corrosion resistance
• Minimal cavitation
• Reduced cooling system pressure

Acceptable Range — 54.8 Brix

A reading near 54.8 Brix corresponds to approximately 5% water contamination.

This remains acceptable, although some performance degradation may begin occurring.

Monitoring should become more frequent at this stage.

Warning Range — Below 54.4 Brix

Readings below approximately 54.4 Brix indicate elevated water contamination approaching 6–7%.

At these levels:

• Cooling system pressure rises
• Steam formation increases
• Corrosion risk increases
• Boiling protection declines
• Cavitation resistance weakens

Evans recommends technical intervention when readings fall below this threshold.

What Contamination Can Indicate

Abnormal refractometer readings may indicate several potential issues.

Residual Water After Conversion

One of the most common causes is incomplete flushing during initial conversion from conventional antifreeze.

Residual water often remains trapped in:

• Heater cores
• Engine jackets
• Oil coolers
• Hoses
• Overflow tanks

Conventional Antifreeze Contamination

Mixing with traditional coolant introduces both water and incompatible additives.

This may reduce:

• Corrosion protection
• Thermal stability
• Coolant lifespan

Accidental Water Addition

Adding water during maintenance or emergency service can significantly alter coolant concentration.

Moisture Absorption

Evans coolant is hygroscopic, meaning it can slowly absorb atmospheric moisture if containers remain open.

Problems Caused by Excess Water Contamination

When water levels become excessive, operators may begin experiencing:

• Overheating
• Increased cooling system pressure
• Overflow discharge
• Steam pockets
• Pump cavitation
• Corrosion buildup
• Sludge formation
• Water pump wear
• Hose deterioration

Routine refractometer testing helps identify these issues before major damage occurs.

Why Evans Coolant Reduces Cooling System Pressure

Traditional water-based coolant systems rely heavily on pressure to suppress boiling.

That is why many vehicles operate with 15 PSI or higher radiator caps.

Evans coolant behaves differently.

Because it resists boiling naturally, Evans systems typically operate at significantly lower pressure levels.

Lower pressure reduces stress on:

• Radiators
• Hoses
• Heater cores
• Gaskets
• Clamps
• Seals

However, excess water contamination increases vapor formation and raises operating pressure again.

Refractometer testing helps preserve these low-pressure advantages.

Cavitation Protection Benefits

Cavitation occurs when vapor bubbles form and collapse against metal surfaces inside the cooling system.

Over time, cavitation can erode:

• Water pumps
• Cylinder liners
• Pump housings
• Cooling passages

Because Evans coolant resists vapor formation, it greatly reduces cavitation risk.

But rising water contamination weakens this protection.

Routine refractometer testing helps maintain anti-cavitation performance.

Proper Refractometer Maintenance

For best accuracy and long-term performance:

• Clean prism after every use
• Store in protective case
• Keep instrument dry
• Avoid impacts
• Never immerse in water
• Use soft cleaning cloths only

Proper care ensures accurate readings for years.

Final Thoughts

Evans Waterless Coolant offers a fundamentally different approach to engine cooling. Its high boiling point, low-pressure operation, cavitation resistance, and corrosion protection make it highly attractive for performance vehicles, diesel engines, racing applications, heavy equipment, fleets, and collector cars.

However, these advantages depend entirely on maintaining very low water contamination levels.

That is why the NI Supply Evans Waterless Coolant Refractometer is such an important tool.

By routinely calibrating the instrument, monitoring coolant concentration, and responding early to contamination issues, operators can maximize:

• Cooling system reliability
• Engine longevity
• Thermal stability
• Corrosion resistance
• Cavitation protection
• Coolant service life

For anyone serious about protecting an Evans coolant-equipped engine, refractometer testing should be considered essential preventative maintenance.