this doesn't look right...
 

http://i14.photobucket.com/albums/a3...0809091836.jpg

it's bubbled up inside, like it melted.
is this normal or should i be a bit concerned?

i dunna what do you have in your radiator?? coolant or water or cooking oil???

i had coolant and water... i would hope i didn't have any oil in there.

i cant really see the content in the pipe what brand is the oil cooler can you try it on another car???? then you could elimanate that its stuffed or not!

oil cooler? it's to the radiator.

That's pretty typical looking for an old S5 thermostat housing nearing the end of its life.

ok thanks. i kinda figured that.
i'll be upgrading to an aluminum housing soon.