Why is there an odor when the car air conditioner is cooling?

[MayaAnn]

An odor when the car air conditioner is cooling may be due to mold in the evaporator box and ventilation ducts. Air entering the car is cooled or heated by the evaporator box and then blown out through the vents as warm or cold air. During use, bacteria and dust inevitably enter the evaporator box and ventilation ducts. Over time, an odor will appear when the air conditioner is in use. Additional relevant information is as follows: 1. Odor from the air conditioner vents: The best solution for odor from the air conditioner vents is to choose an open, sunny environment, open the car doors, set the external circulation to maximum (without turning on the air conditioner), or blow warm air for 5-6 minutes to expel the odor. 2. Odor from the air filter: The air filter should generally be replaced once a year, but if the air conditioner is used frequently or the external environment is extremely poor, replacing it every three months is also feasible. A dirty air filter can be simply blown out, but avoid cleaning it multiple times, as the filtering effect of the air filter will significantly decrease.