Why does my car smell bad when I turn on the AC?

As your vehicle ages, bacteria can grow in the system where moisture typically collects — particularly on the A/C’s evaporator. When this happens, a pungent, mildew-like smell can get blasted into your cabin through your A/C vents.

Why does my car smell when I turn on AC?

Probably one of the reasons why there is a distinct smell in your air conditioner when you turn it on is the growth of mold in your air vents. … As the car becomes older, bacteria, mold, fungi, and micro-organisms can start to grow. The growth of these bacteria is often behind the dash panel on the evaporator.

Why does my car AC smell sour when I turn it on?

Vinegar smells in your air conditioner doesn’t mean that someone tampered with your car. … Instead, you likely have some sort of buildup of natural material in your air conditioner or vents. As plant matter decays, it can ferment and turn into alcohol, then “sour,” forming either vinegar or a vinegar-like smell.

How do you get the musty smell out of an air conditioner?

How to Remove the Musty Smell from Your AC

  1. Turn off your air conditioning unit.
  2. Change the air filters.
  3. Clean the evaporator coils with a cleaning agent or bleach solution.
  4. Clean the condensate line with the cleaning solution.
  5. Gently wipe the air conditioner clean and leave to dry.
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Why does my AC smell like rotten eggs?

An air conditioner that smells like rotten eggs or sulphur almost always means one thing: there’s a gas leak in your house, which is getting into your ductwork. Natural gas is a hazardous substance. It can catch fire, explode, and/or reduce oxygen levels in the bloodstream with severe, often fatal, consequences.

Why does my AC smell bad?

All air conditioners work by converting hot air into cold air. … These droplets of water should drain out via the AC duct, but at times the moisture and leftover water causes fungus and bacteria to grow inside the AC ducts. This causes a foul mouldy stink in your AC which is similar to the smell of dirty, old socks.

Does a musty smell always mean mold?

If your home or clothing smells musty, chances are you have mold or mildew hiding out. … So that musty odor you are smelling is not “just” mold but is a result of the chemical compounds released at different stages of the mold’s growth.