A coolant reservoir is also known as an expansion tank or recovery tank. It’s purpose is to store coolant for future use. Without it, coolant would drip uselessly to the ground, making your engine at risk of overheating. Also, you’d be spending even more money buying coolant just to keep your engine at a stable temperature.
Once the engine temperature becomes stable, the coolant stored in the reservoir flows back to the radiator. This way, you wouldn’t have to keep on refilling your radiator with expensive coolant. Yet aside from serving as storage for the coolant, this reservoir also helps in removing air bubbles from the system. So, the coolant is able to soak up heat more efficiently. On top of that, you wouldn’t have to worry about rust forming from oxygenation.
Coolant tanks are mostly made out of plastic. Like most materials, plastic expands and contracts when hot or cold. Aside from your engine heating and cooling while you drive, your car also has to deal with Chicago’s extreme cold and hot weather. These temperature changes breakdown the coolant tank and can cause cracking.
BMW’s are known for overheating and this is mostly due to the coolant tank. It is a well-known problem in most BMWs and it may be due to a different type of plastic that BMW uses from other automakers. If you notice that your BMW is overheating or continually adding coolant, then you may have a leak somewhere.
If you have any questions or concerns about your vehicle, feel free to give us a call.
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