Low speed heating is most likely not enuf air or coolant flow. You have a new pumpa nd plate, but did you minimize the impeller-to- plate clearance?
A 7 blade fan would move more air.
Did you check the gauge for accuracy? When it's not overhaeting but warmed up, the gauge should be at around the thermostst tem, i.e. 180.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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