I noticed that I have this brown stuff on the outside of my coolant reservoir, under the cap, I guess? Not sure where it's from or what's causing it. See attached pictures. (I didn't remove the cap.)
Any thoughts? Anything to be concerned about?
My coolant level seems to be normal. It showed at about 1/3 above the MIN line of the distance between MIN and MAX (at morning cold temperature with engine off).
After looking at the pics closely, it looks like all that stuff is in line with your serpentine belt. The belt probably slung it there. As to where it came from, I don't know. Maybe the shop over greased something and somehow the belt picked it up.
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