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Fluid Conversion Process: From Water-Based to Evans Waterless Engine Coolant

The primary objective of converting to Evans Waterless Engine Coolant is to eliminate all of the problems associated to water, whilst increasing reliability and engine life. Specifically, to prevent overheating, corrosion, erosion, pressurisation and detonation.

Conversion from a water-based coolant to Evans is a straight forward process that can be undertaken by anyone with some basic experience in engine mechanics, provided the instructions below are adhered to. The time to complete a conversion will depend on several factors including experience, engine design, and workshop/tool facilities – we recommend the DIY enthusiast allow 3 hours and a professional mechanic 2 hours. If several engines are to be converted simultaneously then the average time taken will reduce with confidence and practice – Evans technicians usually complete a car engine conversion in 90 minutes, sometimes less. For larger diesel engines, as fitted to trucks, gen-sets, plant etc. we recommend conversion by a professional mechanic or Evans accredited conversion centre.

If the engine to be converted is currently filled with a water-based coolant then a two-step procedure is involved, Steps 1 – 24 below. However if the engine is ‘dry’ then it’s a simple case of filling with the appropriate Evans coolant and making sure all air has been vented from the cooling system, Steps 22 – 24 below.

Evans Prep Fluid is specifically formulated to hygroscopically absorb any water-based coolant remaining in the cooling system after initial drain. Because certain parts of the cooling system might not drain out with gravity, and it would take too long to disconnect every pipe etc., installing a scavenging fluid is the most practical method of removing all the water-based coolant. The Prep Fluid is not formulated to chemically clean the engine of rust and scale, but the process of circulation and draining will help remove any loose sediment.

If you have any questions prior to or during the conversion process please feel free to contact Evans HQ or any of our accredited conversion centres.

Draining the coolantDraining the System
Whilst not essential we would recommend the engine is run until warm. This will help ensure any sediment is partially loosened and coolant viscosity lowered. Drain the existing coolant from the entire cooling system including the heater matrix and all hoses. Remember that antifreeze is toxic and should be collected and disposed of responsibly.

Tips & Tricks
Blowing low pressure compressed air through the system after draining can help remove any coolant that remains within dead legs etc. Jacking the car so that it is angled toward the drain plug will also help.

Fill with Evans Prep Fluid Using Evans Prep Fluid.

To further ensure that the cooling system is as free from water as possible we recommed Evans Prep Fluid. This hygroscopic fluid absorbs any residual water and removes any loose dirt and scale. Fill the system with Evans Prep Fluid and run the engine until normal operating temperature is reached. Allow to cool then redrain.

Tips & Tricks Once you have drained the Prep Fluid store it in an air tight container as it can be used several times.


Fill with Evans Prep Fluid Fill with Evans Waterless Coolant.

Fill the system with the appropriate Evans coolant. Run the engine until normal operating temperature is reached to displace any trapped air. After the initial fill check the coolant level and top up if necessary.

Provided the system is not left open to the atmosphere or accidentally contaminated with water it will last the life time of the engine. Forget longlife, Evans is 4life!