Coolant Problem

[Vbonz@aol.com]

I have a perplexing coolant leak problem.  I have a 1990 200tq with a small
coolant leak.  The leak is only noticeable immediately upon shutting down the
engine and only while the engine is still warm.  The engine never runs hot
(never goes past a few notches on the gauge).  It only leaves about a 10 inch
diameter stain.  I drive the car about a 100 miles a day and it takes a week
for the car to leak enough coolant to activate the low cooling light (about 2
inches in the reservoir).  I had the car pressure tested and they found no
leaks.  The leak drips off of the left side (driver's perspective) of the
horizontal stabilizer, but I can't trace it.  Any suggestions would be
appreciated.

Vince
'90 200tq