A problem that has plagued my '83 944 for some time has finally been
solved.  Those of you who have had water in the floor after a heavy
rain, have been told that it was probably a leaky battery tray, or
stopped up drain hoses from the sun roof, or leaky seals around the
rear hatch, or a leaky windshield.  

After checking all of the commonly recognized leak sources  and
several unnecessary "repairs" in an attempt to stop the floods, I
finally resorted to a using a large sheet of plastic and the garden
hose to isolate the problem.  I quickly eliminated everything rearward
of the windshield.  

Lowering the plastic sheet to the bottom of the windshield eliminated
that as a source.  That left something inside the engine compartment.
The battery tray did not leak.  Working my way across the firewall, I
came to the plastic cover/shield over the heater fan.  That area
leaked like a drain!   The sealant had deteriorated badly in the back
next to the firewall where it wasn't easily seen.  I easily  worked
the cover loose and re-sealed it with black silicone goop.  

My 944's floor has remained bone-dry after several heavy rains.
Problem solved.

Ken