With 65K on coach had HCU go south so took it to Sante Fe to shop I really trust. While changing HCU they noticed small leak from head so they pulled heads and checked and all was good except for gasket. They replaced items in coolant system including thermostat with 180 degree unit. Coach runs at 180 most of time given conditions. With ambients in mid 90's it may get to 190 to 193 butt it takes a long pull on grade to get above 200-205. On 6 % long grade it will get to 225-230 but fan clutch brings it back to 190 no problem
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Workhorse does not make parts.. they are out sourced ... they put parts on chassis.. you can save a lot if you find who made them.. if you like to spend 3 or 4 times that ok.. that is what rv ing is.. you get to choose.. UFO just looks like a Chevy truck turned backwards to me.. but I admit I don't own one.. as an old wrench hand it seems to me many rv runs hotter then needs to be.. with the cost of eng replacement... I choose to run as cool as possible.. I use 160 thermostat and extra eng and trans oil cooler... but I don't run in winter and weather seems hotter and hotter... I am even adding oil cooler to older gen.. you have to adapt to the changes in climate.. good luck and let us know what you did..