Question: how do you know if you need to replace your radiator?
Answer: There Could be a Leak. One common sign a radiator is going bad is if it is leaking coolant, which can be caused by a crack. ...  There Could be Rust. ...  Overheating is a Sign of Radiator Problems. ...  A Thermostat Goes Bad. ...  Air is Present in the Cooling System. ...  The Water Pump Fails. ...  An Obstruction in the Cooling System.