If your talking about the sauer danfus (spelling) fan controler, Monaco will sell you one for about $830.00. Check the wires going into the controler, if there is a nick or a crack in the insulation the fan will go off and on when you jiggel the wires around. Monaco also told me to go to a Cummins service center and have them hook up a computer to see if the fan controler is getting the right signal from the engine. The unit is easy to install your self. I hope this helps.....Bruce
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Bruce and Sandy 2018 Coachmen Leprechaun 26DS Chevy
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