water leak means the water inlet shut off valve is stuck in the open position. usually a simple handyman repair ... the valve is probably a crudded up with either fungus or corrosion. the sound may, possibly, be because the pump has failed and no longer wets the evaporation pads. In which case, it likely doesn't work very well either.
if you are renting a trailer with this cooler, it is landlord's responsibility to repair it. If you own it, it is your responsibility. And if it is in a common building, then you complained to the correct people but they likely didn't act because it was a weekend and they didn't want to pay overtime rates
grampa -- i've had those and repaired them myself