Do you have a leaky radiator?
Your car's radiator prevents your engine from overheating. Coolant from the radiator flows to the motor keeping it from overheating.
Suppose your car is overheating or you have a coolant leak that the fluid looks red, yellow, or green. In that case, it may be time for a new radiator or repair the radiator components like hoses, tubes, clamps, radiator caps, or thermostats.