The conversion process is not complicated but should be done thoroughly and according to written instructions. Basic Installation Procedure: Drain all old water-based coolant out from radiator, block, and heater core if accessible. Use high volume air to force out remaining coolant Fill with Evans Prep Fluid (waterless flush) and run for 15 minutes to circulate. Allow to cool and drain out Prep Fluid in same manner as old water-based coolant. Fill with Evans Waterless Coolant and run for 15 minutes to circulate. Top off as necessary. 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.