As long as the powerhead isn’t overheating, I wouldn’t be too concerned about it but you may have a restriction somewhere in the system. Some of these motors sold in Northern areas came with a restrictor inserted in the water tube right above the pump to help keep the temperature up while operating in cold temps. Without a thermostat to control the temperature, they would tend to run too cold.
I doubt if the guys in Florida have ever seen one of these restrictors, like this one installed in a ’55 Johnson CD water tube.
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