Volvo S40 Coolant Reservoir ensures that the engine is not exposed to air, but the expanding antifreeze is collected to be pumped back when the temperatures are lower to stabilize the temperatures and safeguard the crucial components. The plastic tank is placed at the head of the cooling circuit, where it is attached to the radiator with a thin hose on all Volvo to allow excess fluid to pass through at times of a heat spike and ensure the circuit remains full and rust-free. This loop-sealed technology prevents untidy spills, prevents animals from being exposed to poisonous glycol and also prevents the formation of bubbles that rob pump efficiency. The two versions of the small S40 sedan take one of two factory designs, either a lightweight overflow style with a snap lid or a reinforced pressure-rated expansion style which has a weight limit on the tank itself. Distinct level marks can be observed quickly enough to confirm the coolant level before going to school or work, and the high mounting position secures the wandering air at the top so the thermostat and heater can react more quickly. The quality seals and durable molded plastic provide a long service life to the part and add to the overall Volvo image of reliability. With constant pressure, the Coolant Reservoir assists the fans and thermostat in operating within their optimal range, which reduces fuel consumption and ensures the aluminum head is not subjected to heat stress. It fits with ease on any 1995-2012 S40 regardless of engine or gearbox because of the similar bosses and sizes of the hoses. Minor details such as a strengthened neck that will not allow the cap to overtighten and a body that can remain transparent over the years make this Coolant Reservoir stand out, which is why Volvo car drivers are placing their confidence in it because they want to find efficiency and safety in a single convenient package.
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