Why Odours Coming From the Air Conditioning Vents?

In Air Conditioning (A/C) mode, air blown across the evaporator is cooled and moisture in the air condenses on the evaporator. Dust, pollen and other contaminants can mix with this condensate and support the growth of micro-organisms. Additionally, in warm, damp conditions, bacteria and fungus may buildup on the evaporator. These micro-organisms may cause some odours. If you use your vehicle's A/C system only for short periods, then it may be especially prone to this phenomenon.
 

To reduce the chance of such a buildup in your vehicle's A/C system, please follow these recommendations.

  • Where feasible, run the A/C system for longer periods.
  • When more condensation collects and drains off the evaporator, it has a cleaning effect on the evaporator. Contaminants wash off the evaporator with condensate and drain out of the HVAC case to the ground below the vehicle.
  • If your vehicle is equipped with a cabin air filter, replace it with a new one when it gets dirty.