Deionized water (or distilled water) is recommended for both 1st and 2nd generation coolants, as the minerals in the water can precipitate out and restrict coolant passages. This is a more important concern in areas with a hard water supply. This may be putting a fine point on things, but Toyota specifies the use of deionized water (water that’s had the minerals stripped out of it) in its cooling systems. Antifreeze that gets too old will begin to eat away at important internal engine components and plug up internal cooling passages, which can lead to overheating and cause additional damage, expense, and inconvenience. However, the corrosion inhibitors break down with time and heat. When flushing the cooling system, we drain the radiator and the block and run fresh water through the system until there’s clean water running out of both the radiator and the engine block drains prior to refilling the system with new coolant. As long as it isn’t diluted with water, the freeze protection and the ability to cool your engine stays good forever. It also has ingredients that act as lubricants to prolong the life of the water pump seals. In addition, it has corrosion inhibitors to prevent the metal in the cooling system from being eaten away by the water in the coolant. Good clean antifreeze not only protects your engine from freezing in the winter, but of course also acts as a coolant that keeps the engine from overheating year round.
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