A vehicle’s radiator helps to keep the engine from overheating. It contains a mixture of water and coolant, and if it is cracked, your car can break down. A bad radiator can also lead to engine damage. Several things can cause a cracked radiator.
Rust can destroy the metal in the radiator, causing a crack. Car radiators are prone to rust because they hold water and are usually at least partly metal
The radiator has a thermostat that helps to regulate the amount of fluid used to balance the engine temperature. A faulty thermostat can cause overheating or high coolant pressure inside the radiator, leading to a crack.