Thanks Larry.
I'll inspect further.
Feeling a little sheepish given the somewhat obvious clue. (coolant)
I'd seen coolant there before but that was during the initial filling process
so I assumed it was due to spilled coolant.

If the crack is bad, I'll be curious to see what vendors have for new tanks.
The then new tank I installed in my Jetta swap didn't last long.

Neil.

On 4/30/15, Larry Alofs <lalofs@gmail.com> wrote:
> Sure looks like residue around there.  Have you pressed hard on it to watch
> for it to open up or leak a little, maybe when it is hot and pressurized?
>   You should also be suspicious of the seal (O-ring?) around the level
> sensor.  If you pull the sensor out you can also see whether the "crack"
> extends into the threaded area.
>
> Larry A.

--
Neil n

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