Posted on 10/15/2026
You notice a small coolant spot under the car, but the temperature gauge looks fine. The radiator has a crack, and the leak seems minor. Can you keep driving as long as you top off the coolant from time to time? A cracked radiator needs a prompt inspection because its behavior changes as the cooling system heats up and pressure builds. The size of a puddle after parking doesn't show how much coolant escapes while driving. A leak that seems manageable can turn into an overheating problem. A Radiator Crack Can Leak Differently When Hot The radiator releases heat from the coolant as air passes through its core. Its tanks, tubes, and connections work in a system that gets hot and pressurized. A crack may seep slowly when the car is cold, then lose coolant much faster once the engine reaches operating temperature. Some leaking coolant evaporates on hot surfaces instead of pooling, so residue or a steadily dropping level can tell you more than the size of a stain. Do ... read more