Guv Bob wrote:
OK, back to the beast again. On the road, temperature is just
slightly above mid-range, where it has always been. When stopped
with engine idling, the temp slowly increases. If I set for more
than a few minutes, it approaches max full scale. When I drive off,
it comes back to normal.

Another symptom - that may or may not be normal or related - is when
I start up cold, it takes a good 10 minutes to come up to
temperature. Other car takes about 2 minutes.

R/R fan clutch -- no change.

Is there an electric fan which normally comes on when an engine driven fan is
not sufficient. That system could be inoperative.