Car air-conditioning filter - replace at the right time so as not to smell Open the trunk, remove the two bolts, remove the lever, pull out the way to remove the air conditioner filter to check or clean or replace. Air-conditioning filter or cabin air filter, this type of filter function filters dirt in the air outside the environment before being sucked into the car. In addition, the air filter also has a filter function for some polluted gases, high-grade can also remove odors or filter impurities. After a long time of use and depending on the weather, the dirty air filter will reduce the intake flow in the outside air intake mode, causing the car to cool slowly despite the high fan speed. Over time, dirt accumulates, the filter becomes wet, so it is easy to create a variety of bacteria that form toxic gases. Meanwhile, if to use, the air-conditioning will bring bacteria, mold, and odors into the cabin. Moreover, when the filter is dirty, clogged, it will cause the air conditioner to cool down to the maximum, continuously wasting fuel. So when to replace air conditioner filters and is it simple to replace them? According to the periodic maintenance standards of some car manufacturers, the air-conditioning filter will replace after 20.000 km. If the weather conditions are more dusty, hot and humid, replace the air conditioner filter earlier. In addition, users also need to check and clean every 5.000 km (or check cleaning after every oil change). Car manufacturers also recommend that customers should use genuine products. Based on the recommendations in the instruction manual. The air filter should be replaced at the start of the summer or earlier than recommended in areas with a dusty, active environment.