What to look out for when dealing with radiator issues
First and foremost, check that the Radiator or Coolant Reservoir are filled to the correct level of coolant! A low coolant level will continue to cause issues even after suspected parts are replaced. A proper diagnosis of any cooling system issues should be performed, including a pressure test to check for leaks. A stuck thermostat, leaking head gasket, or even a failed radiator cap could cause an overheating issue. Depending on the age and condition of the cooling system, related or conveniently located parts should be replaced at the same time. Hoses, fan clutches, thermostats and thermostat housings, and any other component that requires draining the cooling system to service and are near their end-of-service life should be replaced. Also, refrain from using any “leak stopper” products in your cooling system. While they may appear to save money in the short term, their ability to stop leaks will also eventually clog and stop circulation in the cooling system. This could affect the radiator, heater core, and engine coolant passages. This clogging will cause the engine to overheat from insufficient coolant circulation, and can be extremely costly and difficult to fix.