Oh jsolo one other side benefit of a the reservoir being part of the pressurized system vs an overflow is the coolant is always circulating through the clear reservoir, this is great for a visual condition check of the coolant for if any signs of oil contamination from a oil to water cooler (Common on vw, GM), also if you have no constant/consistent circulation then you know the impeller of the water pump has broken (extremely common vw/Audi 1.8t).
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