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95% clean vs 50%: Why coolant flush matters

Open the drain valve (drain cock) at the bottom of the radiator and let the existing coolant flow out by gravity. Then refill ...
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.