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The expansion tank works by providing a reservoir for excess coolant to collect and expand as the engine heats up during operation. As the coolant temperature rises, it expands and flows into the coolant reservoir, relieving pressure in the cooling system and preventing damage to the radiator hose and cooling components. During cool-down periods, the coolant contracts, and excess fluid is drawn back into the radiator to maintain the appropriate level. This cycle helps to regulate engine temperature and prevent overheating, ensuring smooth and reliable performance on the road.
Our range includes a variety of radiator expansion tanks suitable for different makes and models of vehicles. Whether you’re searching for a coolant reservoir for your Vauxhall Mokka, Fiat 500, or Ford Focus, you can use our vehicle lookup tool above to easily find parts that are compatible with your car.
We have over 70,000 products in stock and are rated Excellent by members, so you can shop with confidence at My Motor World. Buy an expansion tank for your car and get free UK delivery when you spend £25 or more. Members also get free next-day delivery, plus access to exclusive rewards and discounts.