The drain or drain piping (usually PVC piping) is under or on the edge of the drain pan, under the unit. It has to exit outside some where. Either down thru the wall into the crawl space and out thru the foundation wall. Or thru the attic to a gutter outside on the edge of the soffett. Look for white PVC piping outside the house where I indicated. Then you can use a garden hose and high pressure to unclog it from at it's termination point, by back flushing it.
Hope this helps you. Please let me know. Thanks
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