Coolant Hose A2125015782 For Mercedes W212

The radiator overflow hose, also known as the coolant reservoir hose or expansion tank hose, is a crucial component in a vehicle's cooling system. Its primary function is to connect the radiator overflow tank or coolant reservoir to the radiator, allowing for the proper circulation and expansion of coolant. The radiator overflow hose is typically made of durable materials such as rubber or silicone, ensuring flexibility, durability, and resistance to high temperatures and coolant chemicals.

The radiator overflow hose is designed to handle the pressure and flow of coolant during the expansion and contraction of the cooling system. It plays a critical role in maintaining the proper coolant level and preventing overheating. As the engine heats up, coolant expands and flows into the radiator overflow tank through the hose. When the engine cools down, the coolant is drawn back into the radiator through the hose, ensuring a consistent coolant level and preventing air pockets in the cooling system.