No idea, but are you sure thats the only place coolant is escaping? Maybe have a real close look at everything, sometimes wierd stuff happens like a leak (of anything) is somewhere else, but gets blown by the fan or etc, ends up leaving just a drop where your eye catches it, but the leak is elsewhere. Next you notice the problem, maybe check the underside of all hoses, hose connections, heater valve etc. You may find a bigger leak somewhere else and the coolant is just getting deposited there? You could also try drawing all around the temp send with white chalk, warm it up, and watch to see what happens. As for the guage not moving, um........ no water/coolant will cause the temp guage to stop moving much, blocked water passage? Or... any chance low radiator fluid level?
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