I dont have any experience with a Caravan. I have a Dodge full sized van,
but that is a different thing.
A water pump traditionally CAN leak like a sieve. Under pressure, if the
packing around
the shaft fails, water can literally spray out.
I have also seen them so corroded on the inside that "leakage" would be an
understatement.
If you can get a mechanics "mirror on a stick", and a good light, maybe
you
can spot
where the coolant is actually coming from.
Now, did the tube which you replaced fail from internal or external
corrosion?? If
internal, consider what may have happened to the inside of the water pump,
and also
to the Welch plugs (freeze plugs) which are pressed into the core wash
openings on the
sides of engines.
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