Coolant does more than keep the engine from overheating. It also helps protect the radiator, water pump, heater core, hoses, seals, and internal engine passages from heat, corrosion, and buildup. When coolant gets old or contaminated, the cooling system can lose some of that protection. A coolant system flush can help when the fluid is dirty, weak, rusty, or past its service life. It is not a magic fix for every cooling system problem, but it can be an important part of keeping the system clean and better protected. The key is knowing when a flush makes sense and when the vehicle needs repair first. What A Coolant System Flush Does A coolant system flush removes old coolant and helps clear out contamination from the cooling system. Fresh coolant is then added in the correct type and mixture for the vehicle. The goal is to restore better corrosion protection, heat transfer, and coolant quality. Over time, coolant can become acidic, dirty, or weak. It can collect rus ... read more