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Nissan Pulsar 1984: Water or coolant?

I HAVE a 1984 Nissan Pulsar which I regularly service. I have recently replaced the top radiator hose and radiator cap and flushed the cooling system. It has always had water in it, but I have since replaced this with premixed coolant. Are there any issues with coolant in older cars? They seem to have only water in their cooling systems.

COOLANT contains an antifreeze which protects the engine at low temperatures by preventing the coolant from freezing. It also raises the boiling point, giving you a little more safety at higher temperatures. Coolant contains a rust inhibitor which prevents corrosion on the cooling system. It's particularly important in alloy engines. Few engines, even older ones, had just water in the cooling system. They start out from the factory with a mix of water and a rust inhibitor. The only reason there might be straight water is if it has been topped up with water without any inhibitor. Regularly flush the cooling system and refill it with fresh coolant.

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