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Q: Death in the A/C

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A few days ago I turned my car on and there was a loud rattling sound in the engine for a while. It eventually stopped but the next day when i turned it on, there was a death-like smell coming out of the air vents. Once I realized the smell and sound was coming from the vents I turned it off. The smell is only evident when the ac is on. I am sure it's something worse than regular grime or mildew, and I would like to figure out how to solve this issue and if possible do it myself.
My car has an automatic transmission.

Hello, thanks for writing in about your Audi A6 Quattro. You should remove the A/C blower motor and see if a mouse or rat got into the A/C system if the smell is as bad as you’re describing. They can sometimes get into the system and they are killed by the blower motor. If this happens there’s usually a loud noise followed by a smell. If you need help with this, consider YourMechanic, as a certified technician can come to your home or office to diagnose the smell for an accurate fix.

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