Flushing Your Engine Coolant. … That’s not to suggest that a cooling system service isn’t necessary any more; it’s still important to replace your car’s coolant every few years. But today, all that’s really necessary is to drain out all the old coolant and replace it with new.
Coolant flush full services
Your cooling system is what keeps your car from overheating. It works by circulating a mixture of water and coolant through the engine. … A cooling system flush essentially flushes out the entire system of contaminants and replaces the coolant mixture with fresh coolant and water.