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the engine likes to steady-state at 180. folks with low temp (160) tstats note that their cars still run at 180, even with the tstat open sooner and more often. so, something has thrown your engine off. the coolant loss is disturbing but perhaps was low before and just not noticed? similarly the bang might just be coincidence. as all have noted, a visual inspection is the best step - underbody panels, serpentine belt, coolant hoses, water pump, tstat housing, idler pulleys, a/c and alternator pulley, radiators (noting that the a/c condensers are in front and block full view).
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