There is water collecting inside in the bottom of it
You have one of two things possible.
First is the evaporator pan. It may have a hole in it from corrosion, not be fastened in a level position, or the drain filling is broken loose and leaking.
Second would be the drain line from the pan may be blocked from mold, dust, fungus or foreign object.
The first one can be found with a visual inspection, flashlight and mirror. Reach up behind the pan and feel for water laying in it. If it has water in it, the drain is plugged. Take a wet vac and go into the compressor compartment. You will see a plastic tube with a loop over the evaporation pan. This is where the water goes to that is condensed out of the air and is supposed to drain to. Apply vacuum to it till it clears. Optional method requires the removal of the tube from the drain pan fitting, containing it in a covered container with cloth, and use compressed air. This method does make a mess, but will dislodge a tighter obstruction.
I forgot to mention, make sure to check your door gaskets. If they are leaking the cooler will make more condensate.
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