I would like to get more details regarding this control on our 1995 U320 Cummins M11 engine. I believe it's the wax valve for the hydraulic fan control but I'm unable to read the label on it. I think it's performing properly but I'd like to identify it for future reference.
That is the wax controller for the Sauer Danfoss Thermo Wax Valve 553/1/09857/200 - Northwest RV Supply (https://www.nwrvsupply.com/product/sauer-danfoss-thermo-wax-valve-553-1-09857-200/)
Word is that they almost never fail. I suspected mine was bad (previous coach), and Source Engineering refused to sell me one until I removed it and bench tested it based on their instructions. It was good.