If your car's AC smells like rotten eggs, mildew, plastic, or gas, there could be a problem with the air conditioning system. This article will help you understand why your car AC smells and what causes these odors in the first place.
AC Smells Like Rotten Eggs
You've probably smelled it before. A rotten egg smell is a sign of a refrigerant leak. It can be caused by a leak in the system, but there are also other causes.
• Leaks in the compressor shaft seal or oil seal can cause this smell. The compressor is what pumps the refrigerant into your car's air conditioner, so if it has any leaks, that'll be where you find them most often. If the leak isn't too severe and you haven't noticed any drips under your car when it rains, then there's nothing to worry about immediately—you can take care of this problem once you have time for an oil change or when you're having your next service appointment at a mechanic shop near me.
• If there isn't enough refrigerant in your AC unit as well as leaks from seals (like mentioned above), then both problems will need to be fixed before getting rid of that rotten egg smell.
• If hot air comes out of vents when you turn on your AC unit despite being set at full-blast cold air mode then that could mean there's not enough refrigerant left inside either.
The smell of sulfur or rotten eggs is a sign that the refrigerant in your vehicle's air conditioning system has leaked.
If you smell sulfur or rotten eggs, it's a sign that your vehicle's air conditioning system has leaked refrigerant. Refrigerant is a gas, and when it leaks from the system it can cause the gas to evaporate. If this occurs, you may notice an odor like sulfur or rotten eggs as well as white dust particles on your car's vents and/or inside of its AC unit.
The odor is not harmful to humans, but if left unchecked over time it could result in reduced cooling efficiency for both heating and cooling modes of operation.
AC smells like mildew
Mildew is a type of fungus that can grow in damp areas. If you have mildew growing inside your car, it can smell like rotting leaves or even a wet towel left in the washer too long. Mildew can grow in the air conditioning system, cabin or engine bay.
If you notice an acrid smell coming from your vents, it may be because there are particles of mildew inside your air conditioning system ducts that need to be removed and cleaned thoroughly.

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