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Topping off your coolant isn’t enough—5 reasons you need a flush

While new vehicles may have a “lifetime” coolant, there are some exceptions.
Jalopnik

Here's How You'll Know If Your Radiator Needs To Be Flushed

A car's cooling system is like a linebacker — it's the most important component in a car engine's defense system. It ensures the engine runs at optimal temperatures and prevents it from overheating.