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.
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.
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.
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Most likely, you probably have condensation building in your drip line. You're best bet is to use a wet/dry vac to suck it out. The area of concern is usually directly above the drip pan.
Cold air can carry less humidity than warm air so when the AC unit is cooling air the excess water falls out as condensation.
Look under the front passenger side floor pan near the transition to the firewall. Should be able to see condensation dripping if AC has been used.
It will if the condensation drain is plugged.
The evaporator drain allows condensation from the ac unit to drain. When the drain clogs up water will go into the passenger floor instead.
Cut it off. An AC unit is supposed to remove the humidity from the air and condense it to water which you pump outside the house. I may not be clear on the problem here but I would try to prevent outside air from entering the attic.
It is called condensation.
I am not an HVAC personel, but I have worked maintenance, and see quite a few different styles. I guess it really depends. I have seen drain pans that have little pumps in them and it pumps the condensed water into a condensation line, and I have also seen it drained directly into a condensation line. It really depends on how your a-coil is set, and if other a/c units are vertically stacked or in a horizontal row. If it is low to the floor and it has no drain lines near it, it will probably have a pan with a pump, but it is more efficient to have one drain, and a condensation line that stacks all the units. I have never seen one that drained just into a pan, I'd think that would kind of defeat the purpose of extracting humidity from a building.
Six months for a central ac is not considered new anymore, far from it. Your supposed to change the filter at least once a month... or your condensation pipe is clogged up.