We recommended changing your Land Rover‘s antifreeze every two years. It’s true that the chemical will prevent your engine from freezing for much longer than that. But after a couple of years, continually swished around a hot engine will leave the antifreeze’s essential corrosion inhibitors just about depleted.
Corrosion inside the engine, especially the aluminium parts such as the water pump, thermostat housings, manifolds and cylinder heads, will produce deposits that are carried around the cooling system until they settle in narrow opening and block them like the narrow tubes of the radiator, for example.
That cause overheating, and it’s but the corrosion can eventually perforate aluminium components, and even the 2.25 litre iron engine block.
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