This could be a thermostat that is not opening all the way. How often
to you drain and flush the coolant? This should be done annually. If
it has not been drained and flushed with new coolant on a regularly
scheduled maintenance basis, crud will build up in the system and
cause problems of the nature you describe, for example, a piece of
crud sticks to the shaft in the thermostant and then it binds there
and cannot open completely.
i had the same problem when I didnt bleed the air from the top of the
thermostat. There's a little nut at the top - open it when you fill
the coolant, and close it once coolant spills out. This made my 300
run a lot cooler.
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