...now that you mention it, i do think that i smell coolant. When i bought the car (4 month ago), with minimal repair history, the coolant was VERY low. I flushed/replaced the coolant with the pink stuff and although this went very smooth (vacuum refill), i have had to add a little coolant...it makes sense that i might have a very small leak...in the heater core...crap.
Next question (which i can also search): how do i access the heater core...off to YouTube.
Thanks all who replied...it was the heater core! See pics...new one on order from Pelican Parts (did not choose the Porsche brand at 3x price). There was standing liquid in the mounting box.