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The most common odor problem from a window ac unit is that there is a buildup over time in the drip pan. The pan collects condensation and allows it to drain through a hole in the ac unit. Over time the pan will collect dirt and other particles, and can develop mold. With the ac unit unplugged the cover will need to be removed, and the pan scraped out and washed.
Only the evaporator (indoor) coil collects water from the air called condensate. That is the only water in the system. If you have a water leak, the collection pan or drain has failed. Most systems have a secondary safety pan and drain system also.
As the unit cools the Air, the air is less able to hold moisture. This excess moisture is Condensed into liquid water on the cooling coils (Condenser Unit). A drain pan is required to catch the dripping water and channel it away.
The evaporator drain allows condensation from the ac unit to drain. When the drain clogs up water will go into the passenger floor instead.
If by "exterior overflow drain" you mean a pan external to the AC coil and ducting (often installed on a horizontal attic crawlspace unit), and if there's water filling that "exterior overflow drain," then it would be likely that the coil's own drain pan has formed a leak. If the evaporator coil is older than 10 years, it probably was made of sheet metal rather than plastic, and so it may have rusted through in a location not readily visible.
It is going to be part of the "indoor" evaperator coil. If you know the Brand of the INDOOR COIL and can get the model number you should be able to find a picture of the components on the manufacturers web site or by searching for it on a search engine such as Google or Ask! .com Also you will have a drain line that connects to the outdoors unless it is a window unit.
If the drain line from the ac unit is tied into the sink drain line, the trap leaving the ac unit has probably run dry. Fill the trap at the ac unit with a cup of water and it should stop the noise. Assuming a proper install, kinda hard guessing about it from here without seeing it.
how to find out tonage
I have a York AC unit, model D1NA024N05606C. Can you tell me what year this is.
Water will condense in the inside unit of the air conditioner. This is because the coils in the unit get cold (ad expected) and moisture in the air condenses on them like moisture on a cold glass. There should be a drain inside the unit to drain this water. Check that it isn't clogged.
Look under the passenger side floor pan where the fire wall begins.
Have you checked your drain to make sure it is not plugged?