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Radiators die slowly. Eventually they can not transfer enough heat to keep the engine cool. The symptoms, other than leaking, are coolant temp rising when the engine is under high sustained loads, which is usually not going to happen to a driver focused on economy, unless he has to climb sustained grades or other situations where loads are high and sustained.
I have seen new radiators actually hurt mileage and I don't need to increase capacity in a replacement radiator beyond the increased capacity of an exact replacement.
You definitely either need to raise the cooling fan activation temperature or reduce the thermostat opening temperature.
regards
Mech
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