Evans Cooling Systems has a patented technology for a waterless engine coolant which, the company says, provides superior benefits not found with traditional water-based engine coolants. Water-based coolants must be maintained at a temperature below the boiling point of water to keep the system functional. Evan's HDTC Waterless Engine Coolant protects the engine at temperatures well above the boiling point of water. This results in decreased fan on time and increased fuel savings, along with decreased maintenance costs, and contributes to a cleaner environment.