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Either your radiator is too small or its dirty. Mine stays at 180 until I slow down and have only one of my dual fans on. As soon as I turn on the second fan, right back to 180. I chose electric fans because I race it once in a while and I can cool it down while parked between runs.


My savoy does the same thing,the small rad is just not cutting it at high-way speeds but runs cool in traffic just idling or cruising.
Sometimes just a small amount of slag will cause high speed overheating issues.My rad is brand new but I just have too much engine to cool with a 19" rad
Gus





On the D200 I drove for many years, hot at speed or climbing a hill on the highway told me the radiator was getting plugged. Power flush (hose and compressed air) would help it for a while but the fix was a new or re-cored radiator. NAPA, Autozone or Radiators.com can fix you up. Just make sure you look at the actual specs for the radiator especially core thickness as some aftermarket radiators are really thin.