Many have suggested a stuck thermostat.  My thoughts exactly.
EXCEPT...  the thermostat was in my hand on Friday and prior to its
installation it got boiled.  Closed in cold water, opened gradually to
full open at 187 deg. F.  A couple others suggested w/p impeller.
Maybe, but once again, it was in my hand on Friday and this morning
during the 'burping' process, the level of the pressure reservoir
fluctuated with throttle position/rpms...  Just like its supposed to.

This problem started after the replacement of the 'Bars Leaks' plugged
radiator. I'm convinced that we have a faulty thermostat, but it sure
tests fine. (BTW, do NOT purchase a 1.9 thermostat from NAPA.  Their
listing is incorrect and in will not fit.)

Tomorrow I'll put a thermometer on it and we'll see what we see...

Thanks for your suggestions.

Jim