for me turning it off isn't the problem as you can't help to not hear it , I can " Really " feel it as the cooler/fan is relocated on the front rack right in my face
talk about running motors under water reminds me of when I was a kid , we had a ditch and a pond in front the house , I use to take mini dc electric motors that were unsealed and mount them under home made boats , I would carve the prop out of wood , tedious , I would run them motors under water all day , it was amazing how long they lasted
what could be nice , is to put some type of resistor or what ever electrical device was needed , into the wiring to lower the perimeters of when the fan comes on , a lower temperature might be a good thing , Mel is the electrical guru , I am sure he could come up with something
on the weird side , after many beverages while sitting around the circle jerk , I have thought of having a auto-matic bilge switch on the frame so that when the water level gets up to it and the lever floats then the ground to the fan would be cut off thus stopping the fan , when you came out the water then it would start back up ---- beverages will do that to you