Posted on 1/30/2026
Coolant is one of those fluids people rarely think about until there is a temperature problem. The car is not overheating, the heater works, and there are no puddles under the vehicle, so it feels easy to assume the coolant is fine. The problem is that coolant ages even when everything seems normal. It can slowly lose its protective additives, and that can lead to corrosion, buildup, and cooling system wear that shows up later as leaks, heater issues, or overheating. A coolant flush is not always needed right now, but it is often necessary on a regular schedule. What Coolant Actually Does Besides Prevent Overheating Coolant does more than carry heat away from the engine. It also protects the inside of the cooling system from rust and corrosion. It lubricates parts like the water pump seal. It helps prevent mineral deposits and scale. It also raises the boiling point and lowers the freezing point, which matters in both hot summers and cold winters. When coolant is f ... read more