Evans Waterless Coolants

Evans recommends using Prep Fluid for all installations to ensure removal of all remaining water-based coolant from the cooling system before installing Evans waterless coolant. In a new or “dry” engine, it is not necessary to use Prep Fluid.

The conversion process is not complicated but should be done thoroughly and according to written instructions.

Basic Installation Procedure:

1. Drain all old water-based coolant out from radiator, block, and heater core if accessible.

2. Use high volume air to force out remaining coolant

3. Fill with Evans Prep Fluid (waterless flush) and run for 15 minutes to circulate.

4. Allow to cool and drain out Prep Fluid in same manner as old water-based coolant.

5. Fill with Evans Waterless Coolant and run for 15 minutes to circulate. Top off as necessary.

6. Test for water content to confirm less than 3% water. Water content can be measured with a refractometer or a sample can be sent to Evans for testing.

See our installation information for complete instructions.

A refractometer can be used to measure the final water content after conversion to Evans waterless coolant and uses a Brix scale. Refractometers are most commonly used by fleets or conversion facilities where installations are regularly performed.

It is important to closely follow directions during the initial Evans waterless coolant installation.

A water content higher than 3% will lower the boiling point, and may reduce the corrosion and pump cavitation protection of Evans waterless coolant. If a water test shows there is between 3% and 5% water in the coolant, the corrective action is to drain half of the system volume and add back new Evans waterless coolant. This will reduce the water content to an acceptable range.

If the measured water content is greater than 5%, the system must be drained and refilled with new Evans waterless coolant.

A different radiator/pressure cap is not required with Evans waterless coolant.

A water-based coolant generally requires anywhere from a 7 to 15 psig pressure cap. Higher pressure raises the boiling point of water-based coolant. Evans waterless coolant expands slightly as it warms, creating pressure of 3–5 psig, and the existing cap does not need to be changed.

But it is recommended to use one of our stickers (Decal sets) to advise that a waterless coolant is being used in the system!