Many equipment owners believe antifreeze is a winter-only product. That misunderstanding costs them engines every summer.

Antifreeze—more accurately called antifreeze coolant—is designed for year-round protection. Its full name reveals its dual purpose: it prevents freezing in cold weather and boiling in hot weather.

Water boils at 100°C. Quality antifreeze coolant boils at approximately 110°C or higher. In summer, when excavator engines operate under heavy loads and ambient temperatures climb, the difference between 100°C and 110°C is the difference between a stable cooling system and a boil-over that shuts down the job.

The problem extends beyond boiling point. Water contains minerals that form scale and rust inside the cooling system. Scale deposits on radiator tubes and engine water jackets reduce heat transfer efficiency. Over time, the engine runs hotter and hotter until overheating becomes chronic. Antifreeze contains anti-corrosion and anti-scale additives that prevent this buildup, protecting the radiator, water pump, and engine block.

Manufacturer maintenance guidelines from XCMG and KOBELCO emphasize several key practices for coolant care. Check the expansion tank level weekly—it should sit between the MIN and MAX marks. Top up with the same brand and type of coolant; mixing different formulations can cause chemical reactions that degrade protection. Never use tap water as a substitute or to dilute coolant. Follow the manufacturer's replacement interval, typically every 2 years or 4,000 operating hours.

For fleet managers, the message is straightforward: antifreeze is not a seasonal product. It is a year-round investment in engine longevity. Using water instead saves nothing—it costs radiators, water pumps, and ultimately engines.