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      07-21-2021, 10:35 AM   #2
Opie55
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Drives: '15 650i Convertible
Join Date: Apr 2018
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Look at post 21 in the thread a couple below this one about checking coolant levels. Q Silver posted diagrams of the system. The engine/turbo system goes through the radiator. The charge air system appears to have its own heat exchanger. That makes sense since it's a much lower temperature system. Plus, the level can drop in one and not the other since they are separate, which logically means they don't share a common drain.
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