Portable AC leaking water....how to locate problem?
Pull off the back. It serves as a grilled vent so critters don't crawl in there. The unit will work fine. Look for a pan right under the cooling coils and then look for some hole in the pan that would allow it to drain into the collection container. There could be a hose that disintegrated or maybe the hole just got plugged up. Don't forget, the unit has to be level for it to drain properly.