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You might try bypassing the fan thermostat temporarily so the fan runs all the time. Then see if your low speed/idel overheat issue goes away. if it does, then look for a lower temp (or even better, an adjustable) thermostat.
And don't get too worried about what the gauge says. Overheating involves the car spouting a head of steam like a whale, and (in the case of a PV's open system) it puking half the coolant into a steaming green puddle. If the gague just goes up at idle it's not the end of the world. The more worrisome problem is when it goes up while you are motoring along.
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'63 PV544 rat rod, '93 Classic 245 + turbo
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