2.5T here. Why do I have two coolant tanks?

wake45

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One of them is connected to a metal box in front of the efan and also seems to go to a teeny tiny electric water pump. Is that the only pump or is the 'main' pump somewhere else?

Im guessing maybe the turbo is air/water cooled and has it's own little overflow tank and pump?

But I very well could be wrong.
 
The intercooler is water-air.
 
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