Coolant not being held in expansion tank for long?!!! But no leak either. Coolant not being sent back to expansion tank!

[SuperV8]

Looking at my late 2014 184 I can see two pumps listed - but its not clear which is for which job?

04L965567A Coolant pump PRE2,DK7
5Q0965561B Additional coolant pump PIERBURG

 

[Compo1]

And the number which you posted is for the charge cooler pump, I have already replaced that.

It is, and the part number i posted is for the pump you asked for ! Near the oil filter housing.

Coolant not being held in expansion tank for long?!!! But no leak either. Coolant not being sent back to expansion tank!

Check charge air cooler. Common issue where coolant leaks into there Hi, How does one check the charge cooler? I'm assuming charge cooler is also called the intercooler? And would the charge cooler being messed up cause my symptoms that I have listed above? Thanks for your help and input...

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