Hawk Prep Fluid 5L is specially formulated to prepare a cooling system prior to conversion to Hawk Waterless Coolants. Compatible with all engine types, it is an essential step when an engine contains or has previously contained conventional water-based cooling fluid.

After a standard drain, water may remain trapped in the engine block, cylinder head, radiator, heating system, or various pipes. Thanks to its hygroscopic properties, Hawk Prep Fluid absorbs this residual water and also helps flush out loose dirt and deposits present in the system. It thus prepares the engine before it is finally filled with the appropriate Hawk waterless cooling fluid.

Important: Hawk Prep Fluid is not the final cooling fluid. It is used during the conversion process and must be drained before refilling with the Hawk cooling fluid selected for the vehicle.

What is Hawk Prep Fluid used for?

The primary role of Prep Fluid is to minimize the quantity of water remaining in the system after draining. This step is essential to fully enjoy the benefits of a water-free cooling fluid.

Hawk recommends that , after conversion , the residual water content be ideally 3% or less. This concentration can be checked using a refractometer.

Proper preparation ensures that Hawk’s waterless cooling fluid will perform as intended and minimizes issues associated with the presence of water, such as localized boiling, vapor formation, oxidative corrosion, pressure in the cooling system, and cavitation.

The Benefits of Hawk Prep Fluid

• Preparation before switching to waterless coolant: specially developed for converting a cooling system to Hawk Waterless Coolants.
• Residual water absorption: its hygroscopic properties allow it to remove water remaining in the engine after a drain.
• Compatible with all engine types: allows you to prepare various cooling systems before selecting the Hawk fluid appropriate for the vehicle.
• Helps flush the system: helps remove loose dirt and deposits present in the cooling system.
• Water-free formulation: allows you to prepare the system without reintroducing water.
• Optimized preparation: helps achieve a residual water content of ideally 3% or less after conversion.
• Essential step in the conversion process: ensures that the Hawk cooling fluid used afterward fully retains the benefits associated with its water-free operation.

Features of Hawk Prep Fluid 5L

• Type: Cooling system preparation fluid
• Brand: Hawk Waterless Coolants
• Product: Prep Fluid
• Volume: 5 liters
• Application: Preparation prior to switching to a Hawk waterless cooling fluid
• Compatibility: All engine types
• Main function: Hygroscopic absorption of residual water
• Additional Action: Helps flush out loose dirt and deposits from the system
• Formulation: Water-free
• State: Low-viscosity synthetic liquid
• Boiling point: Above 180°C
• Freezing point: Below -40°C
• Recommended water content after conversion: Ideally 3% or less
• Water content check: Refractometer
• End use: Must be drained before final filling with the appropriate Hawk fluid
• Former brand name: Evans Waterless Coolants
• Former product name: Evans Prep Fluid

Why is it necessary to prepare the system before switching to a waterless coolant?

Simply draining the system does not always remove all the water present in a cooling system. Some of the oldcooling fluid may remain in the engine block, cylinder head, radiator, heater core, and certain pipes.

Filling the system directly with a waterless cooling fluid without properly removing this residual water is equivalent to contaminating the new cooling fluid as soon as it is put into service. However, the benefit of the Hawk system lies precisely in the removal of water and the issues associated with it.

Hawk Prep Fluid therefore serves as the intermediate step between draining the old coolant and filling the system with the new water-free coolant. Thanks to its hygroscopic properties, it absorbs the residual water present in the system. The Prep Fluid, now saturated with this water, is then drained.

The system can then be filled with the Hawk water-free cooling fluid appropriate for the vehicle, engine, and its intended use.

How do you use Hawk Prep Fluid during a conversion?

Start by draining as much of the old cooling fluid as possible. The Hawk Prep Fluid is then introduced into the system to absorb any water that could not be removed during this initial drain.

Once the preparation procedure is complete, the Prep Fluid must be completely drained. The system is then ready to receive the appropriate Hawk waterless cooling fluid.

After the conversion, Hawk recommends that the residual water content be ideally 3% or less. A refractometer can be used to check this value and verify the quality of the conversion.

Prep Fluid must not remain in the engine as the final cooling fluid. Its purpose is to prepare the cooling system before the final fill with a Hawk Waterless Coolant.

Which Hawk cooling fluid should you choose after using Prep Fluid?

Hawk Prep Fluid can be used to prepare various types of engines. However, once the cooling system has been prepared, the final cooling fluid must be selected based on the vehicle, the engine design, the materials used, and its use.

• Hawk Power Cool 180° 5L: for sports cars, tuned vehicles, race cars, and high-performance engines.
• Hawk Classic Cool 180° 5L: for classic and collector’s cars. As a general guideline, this formulation is primarily suited for vehicles from approximately 1950 to 1980. Engine design and system materials remain the primary factors in determining compatibility.
• Hawk Vintage Cool 180° 5L: for vintage and classic cars, generally applicable to vehicles up to the years 1950-1959. This formulation is particularly well-suited for older engines that use materials such as cast iron, copper, and brass.
• Hawk PowerSports R 5L: for street bikes, sport bikes, and racing bikes, particularly those with engines made primarily of aluminum.

The vehicle’s year of manufacture is only a general guide. For vintage and classic cars, engine technology and the materials used in the cooling system must also be considered before choosing between Vintage Cool and Classic Cool.

What are the benefits of switching to a Hawk water-free cooling fluid?

Preparation with Prep Fluid ensures the cooling system is properly converted to take full advantage of the properties of a Hawk waterless cooling fluid. The goal is to remove water from the system and reduce problems directly associated with its presence.

In the hottest areas of an engine, the water contained in a conventional cooling fluid can boil locally and form steam. These phenomena reduce heat transfer to metal surfaces and can create localized hot spots, promoting overheating conditions that can, in particular, contribute to a blown head gasket.

Depending on the Hawk formulation chosen, switching to a water-free coolant offers benefits such as a very high boiling point, low vapor pressure, reduced cavitation, and the absence of water-related oxidation corrosion. These properties help protect the engine, water pump, hoses, gaskets, radiator, and various components of the cooling system.

Evans Prep Fluid Becomes Hawk Prep Fluid

Evans Waterless Coolants is now known as Hawk Waterless Coolants. The product previously marketed as Evans Prep Fluid is now Hawk Prep Fluid. This change affects the brand identity only and does not alter the product’s formulation.

GT2i is an official retailer of Hawk Waterless Coolants. At GT2i, you’ll find Prep Fluid as well as the various Hawk formulations that allow you to tailor the waterless cooling fluid to your vehicle and its engine.

FAQ - Hawk Prep Fluid

What is Hawk Prep Fluid used for?
Hawk Prep Fluid is used to prepare a cooling system before converting it to a Hawk waterless coolant. Thanks to its hygroscopic properties, it removes residual water remaining in the engine after draining the old coolant.

Is Hawk Prep Fluid a cooling fluid?
Prep Fluid is a preparation fluid and is not intended to remain permanently in the engine. After the conversion process, it must be drained and replaced with the Hawk waterless cooling fluid appropriate for the vehicle.

Why isn’t a simple drain sufficient before switching to waterless coolant?
Even after draining the coolant, water may remain trapped in the engine block, cylinder head, radiator, heater, or certain lines. Prep Fluid helps remove this residual water to properly prepare the cooling system.

What quantity of water might remain after the conversion?
Hawk recommends that the residual water content ideally be 3% or less to fully benefit from the properties of the waterless cooling fluid.

How do you check the quantity of remaining water?
The water content can be checked using a refractometer. This measurement allows you to verify the quality of the water circuit preparation.

Does Hawk Prep Fluid clean the cooling system?
Its primary function isto absorb residual water. As it flows through the system, it also helps flush out loose dirt and deposits. However, it should not be confused with a product specifically designed for decoking or intensive cleaning of a heavily contaminated system.

Should the Prep Fluid be drained before adding the Hawk coolant?
Yes. The Prep Fluid must be drained after the preparation phase. The cooling system can then be filled with the Hawk water-free cooling fluid suitable for the engine.

Which Hawk coolant should be used after the Prep Fluid?
The choice depends on the vehicle and engine. Power Cool 180° is intended for sports cars and high-performance engines; Classic Cool 180° for classic cars from approximately 1950 to 1980; Vintage Cool 180° for older vehicles, specifically those dating back to the 1950s; and PowerSports R for street, sport, and racing motorcycles.

Why is it necessary to remove water before adding a Hawk coolant?
The goal of the Hawk system is precisely to operate without water. Reducing residual water helps limit the issues associated with its presence—including localized boiling, vapor formation, oxidation corrosion, and cavitation—and allows you to fully benefit from the properties of the Hawk fluid used afterward.

Can Hawk Prep Fluid be reused after a conversion?
The Prep Fluid collects residual water present in the system during preparation. Once used and saturated with water, it should not be considered a new Prep Fluid for performing another conversion.

Are Evans Prep Fluid and Hawk Prep Fluid the same product?
Yes. Evans Waterless Coolants has become Hawk Waterless Coolants. The former Evans Prep Fluid is now marketed under the name Hawk Prep Fluid. The formulation remains unchanged.

Hawk PowerSports R 5L Waterless Cooling Fluid is specially formulated for street bikes, sport bikes, and race bikes. It is designed for motorcycle engines primarily made of aluminum, with steel and copper components, and is particularly suited to the high thermal stresses encountered in high-performance engines.

Hawk PowerSports R eliminates water from the cooling system and the associated issues: localized boiling, vapor formation, high pressure, corrosion, and cavitation. With a boiling point above 180°C and a freezing point below -40°C, it is a solution particularly well-suited for motorcycles used intensively on both the road and the track.

PowerSports R is Hawk’s formulation designed for street and racing motorcycles. For motocross, trial, enduro motorcycles, and ATVs, Hawk offers another specific formulation: PowerSports.

Important: Properly prepare the system with Prep Fluid

It is essential to prepare the cooling system before switching to Hawk waterless cooling fluid if the motorcycle currently contains or has previously contained a water-based cooling fluid. Simply draining the system may leave residual water in the engine, radiator, hoses, and various parts of the cooling system.

The conversion must therefore be properly carried out beforehand using the 5L Prep Fluid. This fluid removes residual water before the final fill with Hawk PowerSports R waterless cooling fluid.

After conversion, Hawk recommends that the residual water content be ideally 3% or less. This value can be checked using a refractometer. Proper preparation is essential to fully benefit from the advantages of water-free coolant, particularly on a heavily used sport or racing motorcycle.

The Benefits of Hawk PowerSports R Cooling Fluid

• Designed for street and racing motorcycles: formulated for motorcycle engines primarily made of aluminum with steel and copper components.
• 100% water-free: Use undiluted with water after properly preparing thewater circuit.
• Boiling point above 180°C: significantly reduces boiling and vapor formation in the hottest areas of the engine.
• Freezing point below -40°C: no additional antifreeze is required.
• 75% lower vapor pressure: reduces stress on hoses, gaskets, and cooling system components.
• Reduced cavitation erosion: Hawk claims a 75% reduction compared to water-based cooling fluids.
• Corrosion protection: According to Hawk, the absence of water eliminates oxidation-based corrosion.
• Heat protection for internal combustion engines: Reduced vapor formation and hot spots help maintain more consistent operation when the engine is under heavy load.
• Water pump protection: Reduced cavitation helps limit erosion of thewater pump and system components.
• Extremely long operating time: Hawk reports proven use of over 20 years and one million miles without replacement.
• Non-toxic and biodegradable: PowerSports R is certified by Hawk as non-toxic, biodegradable, and non-bioaccumulative.

Specifications of Hawk PowerSports R 5L Waterless Cooling Fluid

• Type: Waterless engine cooling fluid
• Brand: Hawk Waterless Coolants
• Range: PowerSports R
• Capacity: 5 liters
• Application: Street bikes / sport bikes / racing bikes
• Engine type: Motorcycle engines primarily made of aluminum
• Materials: Aluminum / steel / copper
• Usage: Undiluted with water
• System preparation: Pre-treatment with Prep Fluid when converting from a water-based coolant
• State: Low-viscosity synthetic liquid
• Boiling point: Above 180°C
• Freezing point: Below -40°C
• Vapor pressure: 75% lower than water-based fluids, according to Hawk
• Cavitation erosion: Claimed 75% reduction compared to water-based fluids
• Water content after conversion: Ideally ≤ 3%
• Water content control: Refractometer
• Color: Transparent red
• Odor: Virtually odorless
• Toxicity: Non-toxic according to Hawk
• Environment: Biodegradable / does not bioaccumulate
• Packaging: 5 liters
• Former brand name: Evans Waterless Coolants
• Former product name: Evans PowerSports R

For which motorcycles should Hawk PowerSports R be used?

Hawk PowerSports R is specifically designed for street bikes and racing bikes. It is suitable for engines primarily made of aluminum that also incorporate steel and copper components.

It is particularly well-suited for sport bikes, superbikes, modified bikes, track bikes, and racing machines, but can also be used on a compatible street bike when you want to enjoy the benefits of a waterless cooling system.

Do not confuse PowerSports R with PowerSports. Hawk designs PowerSports R for street and racing motorcycles, while PowerSports is specifically geared toward motocross, trial, enduro, and ATVs.

Why switch a motorcycle to a waterless cooling fluid system?

Cooling is a particularly important factor in a high-performance motorcycle. The engine is compact, delivers high power relative to its cubic capacity, and can operate at high RPMs. On the track or during spirited riding, thermal stresses can become particularly high.

With a standard cooling fluid, the water in the system can boil locally in the hottest areas of the engine. The formation of steam then significantly reduces heat transfer to the metal surfaces and can cause localized hot spots.

With a boiling point exceeding 180°C, Hawk PowerSports R remains liquid at temperatures at which a standard cooling fluid may begin to generate vapor. This helps keep the cooling fluid in contact with hot metal surfaces and maintains more uniform heat transfer when the engine is under heavy load.

The absence of water also helps reduce other phenomena associated with it: oxidation corrosion, cavitation, and high vapor pressure. Hawk specifically claims a vapor pressure that is 75% lower and a 75% reduction in cavitation erosion compared to water-based fluids.

A particularly valuable benefit for a sport bike

On a sport or racing motorcycle, reduced cavitation is particularly beneficial for the cooling system and the water pump. Hawk states that its water-free coolants help combat cavitation erosion that can affect cooling system components.

The low vapor pressure also helps reduce stress on hoses, gaskets, and cooling system components. This feature is especially beneficial when the engine runs at high temperatures for extended periods, such as during intensive use or on the track.

A slightly higher engine temperature may be normal

After switching to a Hawk waterless cooling fluid, the displayed operating temperature may rise slightly. An increase of approximately 3 to 7°C may be observed after the switch.

This difference does not necessarily mean the engine is overheating. The fluid remains liquid at high temperatures and helps limit vapor formation and localized hot spots.

Evans PowerSports R Becomes Hawk PowerSports R

Evans Waterless Coolants is now known as Hawk Waterless Coolants. This change pertains to the brand identity and not the product formulation. The former Evans PowerSports R is now marketed under the name Hawk PowerSports R. If you were already using this Evans formulation in your motorcycle, you will now find it under the Hawk brand.

GT2i is an official retailer of the Hawk Waterless Coolants brand. At GT2i, you’ll find Hawk waterless cooling fluids as well as the products needed to prepare and convert your cooling system.

How do you convert a motorcycle to Hawk PowerSports R waterless cooling fluid?

When converting from a standard cooling fluid, start by thoroughly draining the system, then prepare it using Prep Fluid. This step helps remove as much of the water remaining in the engine and system as possible after draining.

Use the 5L Prep Fluid before the final fill. After conversion, the residual water content should ideally remain at or below 3%. It can be checked using a refractometer.

Once the system has been properly prepared, Hawk PowerSports R can be used undiluted with water. Fill the system to the same level as you would with standard cooling fluid.

Hawk PowerSports R must never be intentionally diluted with water. Adding water reduces the benefits intended with a waterless cooling fluid.

FAQ - Hawk PowerSports R Waterless Cooling Fluid

For which motorcycles is Hawk PowerSports R intended?
Hawk PowerSports R is designed for street and racing motorcycles with engines primarily made of aluminum and also containing steel and copper components.

What is the difference between Hawk PowerSports R and PowerSports?
PowerSports R is designed for street, sport, and racing motorcycles. PowerSports is designed for motocross, trial, and enduro motorcycles, as well as ATVs. It is therefore important to select the formulation that matches the type of motorcycle and its intended use.

Why use a waterless cooling fluid in a motorcycle?
Removing water helps reduce the phenomena associated with it: localized boiling, vapor formation, pressure, corrosion, and cavitation. These properties are particularly beneficial for sports motorcycle engines or those under heavy load.

Should Prep Fluid be used before Hawk PowerSports R?
Yes, when converting from a system that contains or has contained a water-based cooling fluid. The system must be properly prepared using Prep Fluid 5L to remove as much residual water as possible before the final fill.

What quantity of water can remain after the conversion?
The residual water content should ideally be 3% or less. This value can be checked using a refractometer.

Can Hawk PowerSports R be mixed with water?
No. Hawk PowerSports R must not be intentionally diluted with water, as this reduces the benefits associated with a water-free cooling fluid.

Can water be added in an emergency?
Yes, but only as a temporary fix when it is impossible to top off the water level with Hawk fluid. This solution must remain temporary. After adding water, you must drain the system again and perform a complete system flush using Prep Fluid before refilling with Hawk waterless coolant.

Do I need to add antifreeze to Hawk PowerSports R?
No. Its freezing point is below -40°C. No additional antifreeze should be added.

Does Hawk PowerSports R protect the water pump?
The reduction in cavitation erosion helps protect the water pump and cooling system components. Hawk claims a 75% reduction in cavitation erosion compared to water-based fluids.

Is a slightly higher temperature after the switch normal?
Yes. A slight increase in operating temperature may be observed after switching to a waterless coolant. This does not necessarily mean the engine is overheating.

Are Evans PowerSports R and Hawk PowerSports R the same product?
Yes. Evans Waterless Coolants has become Hawk Waterless Coolants. The former Evans PowerSports R is now marketed as Hawk PowerSports R, with no change in formulation.