To keep your car running smoothly, you should have the cooling system and radiator serviced the same way that you take care of your vehicle regularly with an oil change service. The cooling system includes the coolant, which moves through the engine as it runs, as well as the radiator, which keeps excess heat out of the engine.
One of the clearest signs that your cooling system needs immediate attention is if you experience your vehicle overheating. You may also notice that the heater is not working normally. The temperature gauge might appear off. Some vehicles will have a warning light on the dash that your coolant is low.
One of the worst things you can do for your engine and transmission is to keep driving your car after you think that it may have overheated. The best thing to do is have it inspected by a certified and experienced mechanic.