What Causes Odor After Replacing the Car's Cabin Air Filter?

[DelValerie]

If there is an odor after replacing the car's cabin air filter, the main reasons are either odor in the entire duct system or the air conditioning evaporator. A dirty evaporator not only affects the cooling and heat dissipation of the air conditioning system but also fosters bacterial growth, leading to odors over time. Therefore, if the air blowing from the vents has a musty, smoky, or sour smell, the evaporator needs to be cleaned. So, can we prevent air conditioning odors in daily life? The answer is certainly yes. Here’s a handy tip: Before reaching your destination and preparing to park, turn off the AC light in advance and set the fan speed to maximum. This helps stop the cooling process early, gradually raising the evaporator's surface temperature to room temperature, thereby reducing or even eliminating condensation. This prevents water droplets from forming on the evaporator surface, which can breed bacteria. By cultivating good habits during regular car use, your vehicle can not only eliminate odors but also extend its service life.