Exactly what do you need help with? water line, electrical, duct work???

The good old days before a/c or maybe not so good old days. I know some places still use them. All 4 side panels lift up and pull out at the bottom. These are what the water circulates through and cools the air as the water evaporates while going down through them. These may just need some cleaning with a hose.

Then clean the crud out of the bottom.

Then check the (usually) plastic or copper water line. Sometimes these break loose or the connection goes bad. It hooks to a float valve in the cooler bottom that keeps the water at a certain level. Make sure it works ok.

Make sure the overflow isn't plugged up as well as the water hose that is usually hooked to it. The hose or the bottom plugs up with crud and then it overflows and runs all over.

Check the connection at the other end of the water line at the hose faucet. Check to see if it flows water without leaking when turned on.

Oil the fan motor if it needs it and the blower bearings with 3in1 oil.

I am doing this from memory from about 35 years ago. Good luck.