If i get this right.

On most 1.9L and some 2.1L the right (looking at engine from the back)
stud/bolt of the 3 (water pump) is always stuck there, seized by coolant.

The stud itself is the problem, if you remove this one you will see that on
some engine the stud thread have a very little hole deep inside that end up
in the water jacket.

So start by tightening this 13mm nut. If it's still leaking, remove nut and
apply sealant.

SAME problem with one of the thermostat housing on 1.9L, one of the 2 bolt
screwed to the pump itself need sealant, the forward one, same problem, new
pump have a tinny hole deep in the thread.

Ben
http://www.benplace.com/vw2.htm

On Thu, 10 Dec 2009 00:43:43 -0500, Walter Houle <whoule@ECSCONTROLS.COM> wrote:

>I just noticed a small coolant leak under the van. 1985 1.9 WBX. It looks
>like its coming from the forward mounting flange of the water pump,right
>below the mounting bolt. It drips onto the oil filter. It is not coming
>from the weep hole under the bearing. I installed this water pump approx.
>2 years and 10,000 miles ago and it has never leaked a drop. Before I dig
>any deeper, has anyone experienced this before? Loose bolt possible? I
>checked the cylinger head gasket as best as I could and it looks fine -
>nice and dry.
>
>Thanks,
>Walter
>85 Vanagon