How often should I flush my radiator?

As with all auto services, let your car’s owner’s manual dictate how often you need a flush. But as a general rule, Kauffeld recommends a coolant service about every 30,000 miles or five years, whichever comes first.

Is radiator flush necessary?

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.

Four Signs You have a Bad or Failing Radiator