What Are the Impacts of a Broken Car Radiator Cap?

[LaEllie]

Car Radiator Cap The impacts of a broken car radiator cap include: 1. Coolant may spray out from the radiator cap: Coolant can spray out from the radiator cap, reducing the flow rate and pressure of coolant entering the engine. 2. Engine overheating: Due to the reduced coolant flow, the engine's heat cannot be dissipated by the coolant, leading to engine overheating and boiling, which can cause damage to the engine to some extent. The radiator cap has three functions: 1. Sealing: Under any operating condition, the coolant in the radiator should not leak through the radiator cap. 2. Expanded coolant can flow into the auxiliary tank: When the coolant temperature rises and the pressure inside the radiator increases to a certain value, the radiator cap automatically opens the pressure relief valve, allowing the excess coolant due to thermal expansion to flow into the auxiliary tank. 3. Supplemental liquid from the auxiliary tank can flow back into the radiator: When the coolant temperature decreases, the radiator forms a negative pressure due to the thermal contraction of the coolant. At this point, the radiator cap automatically opens the return valve, allowing the supplemental liquid from the auxiliary tank to flow back into the radiator.