The common types of coolant available to consumers and carmakers are distilled water, antifreeze (or 50% ethylene glycol + 50% propylene glycol), or a hybrid of these two.
kept at the correct temperature coolants like liquid solution absorb heat like a sponge. one very important aspect is compatibility with the vehicle's radiator and heater core as well as the manufacturer's specifications for the type needed for your make and model. for example, there are cooling systems which when part of them leaks out it freezes when in contact with air creating an ice block in seconds instead of leaking away gradually. it also matters what climate you are operating in because some climates require higher grade fluids to keep adequate flow rates deep