Thermostat question

62 dodge said

I have a serpentine belt system on it. No room for a shroud. Fan is about 1 1/2 away from the rad. Heats up in town driving. Fine on the road.

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No shroud IS a problem, and your issue is a lack of air flow at low speed. A better setup would be a OEM copper radiator with a matching shroud, and the factory style viscous fan assy. JMHO