The Mazda 2 Radiator Cap ensures that the coolant remains under a certain pressure so that the engine will still run cool in case of a snarl-up in traffic or when it is on a mountain road that requires extra power. This small lid was constructed to accommodate about 16 PSI, which elevates the boiling point of the coolant, prevents the entry of air into the system and, with the help of a spring-loaded valve, pushes fluid in and out of the overflow tank to balance the temperature every minute or two. Drivers of the first generation Mazda 2, the agile runabout introduced in 2002, can even fit the same cap style as the later models, and therefore it is widely compatible and saves its owners the confusion of part numbers. The new Mazda 2 is no exception, as the size and sealing profile of the cap are the same across all redesigns, and thus the same part can support three generations of changing powertrains such as Skyactiv hybrids. One of its prime features is that it has two factory-approved styles, one of which is the typical single-valve design that is more stable on the road during cruising and the other is the intelligent dual-valve design that releases additional gas during city stop-and-start traffic to smooth out the spikes in pressure and prevents hose damage. Powerful rubber gaskets and corrosion-resistant metal allow the Radiator Cap to shake off decades of heat stress, further supporting the broader Mazda image of durability. A quickly changed, pulled cap also restores the correct pressure, and this helps to maintain proper circulation of the coolant and prevents boil-over as well as exposure to expensive head gasket failures. Due to its ability to ensure steady operating temperatures, the Radiator Cap will be a direct contributor to fuel efficiency, emission control and cabin comfort, which makes this relatively small component a principal partner in the everyday safety and well-being of the engine.
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