Quote:

well last weekend my Autometer gauge rolled over past 240ºF and was heading for the 0 again...As it idles in park for 15 minutes



Ah, that is bad assuming the gauge isn't bad. Generally, cooling issue at idle/low speed are airflow relate. Can you borrow another fan setup to verify the clutch is out?

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They say there is always the exception that proves the rule.
Don't be the exception.