How are you determining that it is running at 145?
Maybe it is running above the thermostat switch (assuming that is what I see on top of your manifold) set point and that's why it is running all the time?
Also how do you know it is running all the time. It might be unpowered at interstate speeds. Can you see it while driving? Can you measure the current draw of it when driving?
Just looked at your sender again.
That silver coiled part should go to the fan controller.
Also it looks like an old school bulb type in the manifold that controls a diaphram in the temperature controller
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Or is that the temp sender for a mechanical temp gauge?
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