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Residue near the coolant reservoir/tank

brentgti

Go Kart Champion
Location
North America
Car(s)
GTI
I recently noticed this yellow residue near the coolant reservoir/tank and going down the front area/rail on my GTI; however, I cannot seem to easily identify an obvious source. I have also observed that the coolant level has been dropping since the 1 year/10k service (car came with VW Care so I have been letting the dealer handle servicing). I found an older post that suggested that a dirt trail in this area was caused by an issue with the overflow cap, but the images looked a bit different so I am not sure if that's the issue I am experiencing.

Any thoughts on what's going on here?

Thanks!

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