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What is a coolant flush?

Updated: 12/24/2022
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15y ago

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This is when the engine coolant ( which may include anti-freeze, anti-corrosion, anti-boil and other fluids ) is drained from the radiator, hoses, pump, engine block etc and the system is flushed clean with water (which may contain degreasers, cleansers, etc. ). After that, the fresh coolant with the new additives are put into the system.

The usual reason for doing this is to clear blockages from the small radiator tubes and the sludge and dirt that may have been deposited in the slower circulating areas of the engine.

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