Thanks for all the input guys!
Ferdman, you were right on. I changed the thermostat first and the temps went to 80-85 at 65 mph and 90-95 at sustained idle in heavy traffic.
Again, thank you all.
Ken

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Some days are like licking ice cream from a spoon, today is more like trying to staple jello to a brick!
1990 300 SEL