it's a thermostatic switch for 12 v electric fans to control heat at the back of the unit. It's also unconnected, so nothing is being controlled...
(the design was first done by "Klixon" and for those of us of a certain age, that is what they will always be...)
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ChateauV10
St. Charles, MO
Ex-SF Bay Area
'99 Ford E350 V10
'16 Rockwood 8329SS
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