Seems odd that your solar panels (I am assuming these are solar hot water) are not working. Did you verify that there is sufficient flow, aka the pump, valves, etc? Can you verify the smaller tubes are not plugged in some manner? I am not familiar with the specifics of these systems, but it may be possible there is some type of build up inside the system over the years.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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