Problem:  Coolant leak behind belt area (can't quite see because of
sheet-metal engine cover covering the bottom).

  Seems to leak only when I begine to drive, and has been doing so
for about a week.

  Topped up main coolant tank today, engine ran cool, then coolant
started to leak out of hoses onto my passenger floor matts, and
engine is starting to run hotter again.

   Now leaking very steadily from engine area again while engine is
running.