Well seems as though many of you have the same problem.  There is no rust on
the grills or anywhere else nearby so I dont think its rust...but a fresh air
vent could definitally be the key...especially the one on the floor.  I will
check that out tommorow.  Also as someone else stated it does only happen when
the van is sitting...it is very odd!!  Well I will post my finidings
tommorow..hopefully I will be able to find the culprit=).

Tim G
87 gl syncro(164k)