[Vwdiesel] leaking heater?

[Bradley Flubacher]

In the new-to-me '82 diesel pickup, I see coolant puddles in the
driver's compartment. There's a plastic organizer directly underneath
the heater, and it has a puddle. Someone removed the carpeting, so
there's a a bit of coolant on the driver's floor as well.  I'm thinking
this is probably a leaking heater core. Once things warm up a bit I'll
take a closer look. Does anyone have any other suggestions as to where I
should look?

Brad