Why does my air conditioner smell like sewage?

The odor may be emanating from backed up sewage from a ruptured line or sewer vent pipe near your air duct system. If the methane gases from the sewage leak into the duct work, a rotten egg odor can permeate your home when you turn on your air conditioner.Click to see full answer. Herein, why do my air vents smell like sewage?If you smell rotten eggs, you may have a gas leak. If you smell raw sewage coming from your vents, there is one usual cause: sewage. A backed-up sewer line or a crack in a plumbing or sewer vent pipe could cause the smell. If it is close enough to your ducts, then the ducts can spread the smell throughout your home. why does my car AC smell like sewage? Sewage: Most sewer lines smell like they do because of methane. If you smell methane in your home the most likely cause is a ruptured sewer main near the ductwork. Methane gas can seep into the system and spread throughout the house. Methane is harmful in large quantities, flammable, and has a very unpleasant smell. Keeping this in consideration, how do I get rid of the smell in my air conditioner? Therefore, it’s imperative to remove the cause of any odor from an air conditioner. Combine one part bleach with three parts water in the bucket to deal with any mold or mildew. Turn the power to the unit off. Change the air filter(s). Clean the evaporator coils. Clean the condensate line. Is a smelly air conditioner dangerous?Many times, the smells are not dangerous, just indicative that your system needs service. However, some smells, like rotten eggs or gas are more serious. If you are experiencing an electrical, burning odor, or gas smell, turn off the unit and call your HVAC technician right away.