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Why does coolant flow back into over flow reservoir?
Coolant flows back into the overflow reservoir for several
reasons, primarily related to the design of the cooling system and the thermal dynamics involved. Here’s a breakdown of the process:

Thermal Expansion: As the engine heats up, the coolant inside the radiator and engine block expands. This increase in volume creates excess pressure, which forces some of the coolant into the overflow reservoir.
Pressure Regulation: The cooling system is designed to maintain optimal pressure. When the pressure exceeds a certain threshold (usually regulated by a pressure cap), the cap opens, allowing coolant to escape into the overflow reservoir.
Cooling Down: When the engine cools down after running, the coolant contracts. This contraction creates a vacuum that draws coolant back from the overflow reservoir into the radiator and engine block, helping to maintain the proper level of coolant in the system.
Preventing Air Locks: This flow helps prevent air from getting trapped in the cooling system, which can lead to overheating and inefficient cooling.
Closed System Design: The overflow reservoir is part of a closed-loop cooling system, which is designed to keep coolant circulating efficiently. The reservoir allows for the expansion and contraction of coolant without causing leaks or loss of fluid.
In summary, the flow of coolant into the overflow reservoir is a normal part of the engine's cooling cycle, helping to manage temperature and pressure within the system.