There technically isn't a drain pan in AC units. Some have a little hole in the back, some do not. If they do not, then the evaporator fan "slings" up the water accumulated from the condensation in the air, unto the coil to help cool the inside of the unit. If there is no hole, do not drill into the machine. You are likely to hit a sealed system component and damage the unit entirely.
SOURCE: water is dripping from inside
Window AC's mut be installed with the back slightly lower than the front to allow the condensate (water) to drip outside
SOURCE: AC is spitting out water inside. Where are the drain plugs?
I have the same AC and had this problem. Sludge builds up inside the bottom of the unit from dust and water build up causing it not to drain and the fan spits the water out. Its a fairly simple fix with a philips screw driver and a wet vac. Unplug the AC first. Remove the AC from the window. Remove the screw inside the front panel below the filter screen. Then you can pop the whole front panel off by pulling it with a little pressure. Now you need to remove the 3 screws holding each of the slider panels onto the side of the AC. Then remove the 3 screws on the bottom of the left and bottom of the right side of the AC. Remove the 3 screws holding the bar on top of the AC. Lastly remove the 2 screws on the back of the AC in the bottom Left and Right corners. You can now pull the top cover off. You can now use your wet vac to vacuum out the sludge that is in the bottom of the AC from the right and left side. There's a ground wire that connects from the fan motor to the bottom plate of the AC, be careful not to hit it. I knocked mine off possibly to it having been rusting in the backed up sludge and had to strip the wire and reconnect it.
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