You may notice that the smell of vinegar emits from the vents in your car. You may not know why the smell is present or why it resembles rotten eggs or body odor. Fortunately, the odors won't pose a threat to your health and can be easy to treat. You may notice the strong odor is a lot more potent every time you use the air conditioner to cool off the cabin. Start by shutting the air conditioner off to determine if the smell still lingers. If the smell goes away, this is a sign that it may be a problem with the AC.