Thanks Bribenz. I searched more posts, this time looking for "monovalve" and such instead of just "heat problems" or whatever. I located it on my car and also pulled the glove compartment to look at the foam hose that comes from the temp. sensor. It looks to be in good condition so I'll go right to the monovalve.
As always, I appreciate the fine help from this board.
'87 300D Turbo 220k (for sale)
'03 Dodge Sprinter 3500 tool body (shop truck)
'98 Ford F-150
'04 Subaru Forester 2.5X (wife's car)
'86 BMW L7 (for sale)
'69 Alfa Romeo Spider