Most likely it s the smell of mold and or mildew.
Why do my car vents smell like mildew.
This moisture occurs naturally and is part of the car but if left for too long it can create mold.
You can remove the tobacco stench by shampooing the carpets the upholstery and the headliner using an enzyme based cleaning product.
For example it could happen because of leaves dust and debris that builds up inside the air vents.
That smell is mildew and it indicates that there has been.
In fact the smell happens as a result of mold building up inside the vents.
You should replace the air filter to eliminate the odor.
If there is an odd moldy smell that kicks in as soon as you turn your air conditioning on you don t have to close your nose and bear it.
Smells of mildew in your car may be caused by the growth of bacteria.
That s bad news because your ac is most likely distributing mold and or mildew spores throughout your home.
Frequent causes for musty smells include mold and or mildew in the vent system carpet or headliner.
Cigarette smoke is probably the hardest of the smells to remove from your cars ac vents.
If you re smelling a musty moldy smell think dirty socks then what you re smelling is mildew growing in the system.
Every time your ac comes on the air leaving your vents stinks with a musty odor.
More likely than not you ve built up some mold and mildew thanks to moisture in your ac system.
In most cases this happens for a few different reasons.
What in the world could it be.
The smoke from cigarettes gets into everything within your cars interior.
As the car becomes older bacteria mold fungi and micro organisms can start to grow.
This results in the dirty sock like odor you smell when you first start your car and turn on your air conditioner.
Either way it s supposed to make you comfortable and that s not possible if there s an unpleasant musty smell coming out of your vents.
Even a cabin air filter clogged with rotting leaves or leaking trunk can become odiferous.
Use long handled products to make it easier to reach deep into your vents.
Mildew can also often grow inside air conditioning vents.
This is actually a very common automotive problem and it s generally caused by running your air conditioning system only on recirculate and not blowing the fan for a minute or two after turning off the air conditioning and shutting off the engine.
You can kill the mildew with a homemade solution.