Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Radiator flush › Reply To: Radiator flush October 1, 2022 at 8:15 am #1003004 EricTheCarGuyKeymaster In my opinion flushing radiators is not necessary unless there is an issue with coolant contamination. A drain and refill of the system with the correct coolant at the manufacturer recommended interval is all that should be necessary.