Did You Know? The Difference Between a Radiator and a Coolant Reservoir

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The radiator and coolant reservoir are two essential components that work together to regulate the engine’s temperature, preventing it from overheating. This is crucial for the performance and longevity of a vehicle.

However, they serve different functions. In this article, Motorist will help you clarify the differences between these two parts!

Radiator

The radiator acts as the primary heat exchanger in a vehicle. Hot coolant from the engine flows through small tubes in the radiator, where it is cooled by air blown by a fan. Once the coolant loses heat and cools down, it returns to the engine to maintain a stable temperature.

Coolant Reservoir

The coolant reservoir stores excess coolant and helps maintain pressure in the cooling system. When the engine is running, the coolant expands and flows into the reservoir. When the engine cools down, the coolant contracts and flows back into the radiator automatically. The reservoir also prevents coolant from evaporating out of the system.

Summary of Differences

Radiator: Directly cools the engine.

Coolant Reservoir: Stores extra coolant and regulates system pressure.

To simplify, the radiator is like a water boiler that releases heat, while the coolant reservoir is like a water tank that holds excess coolant.

It’s important to check the coolant level in the reservoir at least once a month or before long trips. If the coolant level drops abnormally, there may be a leak in the system, and you should have the vehicle inspected promptly!

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