If your coolant is not changed on a regular basis, it can actually clog your auto radiator's cooling tubes. Corrosion of the cooling tubes and tanks can occur if it's left untreated for too long. If there is too much pressure in the cooling system, it could result in a crack in an end tank or a cooling tube. For models with plastic tanks, excessive heat can cause the plastic to melt and deform. Your vehicle’s radiator can also suffer physical damage from rocks or other debris puncturing it. If your car or truck’s radiator is suffering from one of these problems, you may need a replacement.