Prep Fluid is a hygroscopic cleaner that removes loose dirt and scale from the cooling system.
It attracts and absorbs moisture from the air.
It absorbs the last remnants of water from the cooling system.
It improves heat transfer efficiency by actively removing loose dirt and scale.
Use Prep Fluid after removing the water-based coolant.
Make sure the cooling system contains as little water as possible.
The Prep Fluid will absorb the last residue.
Next, remove the detergent and then fill the engine cooling system with Evans waterless coolant.