What is this, yellow arrow
looks like the pcv assembly.
Don't think it's that it's leaking coolant.
its called avant return auxiliary heating hose assy,$121.92.
Close enough, after I took it off found a part number on it it actually a little electric coolant pump, and after looking it over closely it makes getting a coolant air lock almost impossible, needs to be made out of better stuff but a good idea. Thanks for the responses.
Looking for a Used A6 in your area?
CarGurus has 177 nationwide A6 listings starting at $3,890.
Search Audi A6 Questions
Audi A6 Experts
Related Models For Sale