This is not what I have seen. All of the original metal pipes I have
checked had major corrosion on the inside, even if they looked ok on the
outside. The pipes are made from seamed tubing.  The seam runs the full
length of each pipe. The seam is where the worst corrosion occurs on the
inside. One pipe does always look worse than the other. Even a pipe that
looks ok inside on the ends can have grape or pea sized nodules growing
elsewhere inside, along the seam of the pipe.

Mark

Roger Sisler wrote:

>..............
>
>It turns out that only one of the two coolant pipes are usually corroded.
>This from the outside, to the inside. VW never seemed to learn to  paint
>things black and not have the  paint flake off. Pulleys included.Check the
>inside of the pipes and you will see that they are perfect.
>
>.................
>