Cooling additives like radiator stop leak, radiator flush and KSeal. These products will help if you find your antifreeze is leaking. Use a sealant to seal leaks immediately when they occur and before serious problems arise. Often they also contain rust inhibitors and are formulated to work with your antifreeze without affecting it. This means your car will be kept cool whatever the weather. Radiator Flush is formulated to remove rust, sludge and scale in all vehicle cooling systems, from engine block to radiator and heater cores. This gives you improved cooling performance, reducing wear and tear on the engine and potentiall also improving mpg.