![]() ![]() Replace the filter at the start of every winter for optimal performance Additionally, if you drive your H3 with AC system set to fresh outside air most of the time, your cabin air filter will get dirty much sooner as compared to air recirculation mode. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturer’s recommendation. There is no fixed time for replacing the cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. If the cabin air filter has not been replaced for a long time, it can get clogged and harbor mold growth, especially in humid environment. Inhaling these unpleasant musty odors is not only irritating, breathing the airborne microscopic mold spores can cause allergic reactions in sensitive individuals such as sneezing, runny nose, red eyes, nausea, and skin rash.ĭirty AC filter is one of the leading causes of bad smell coming from air vents in H3. If the AC in your Hummer H3 smells like a pile of dirty socks, it could be due to unwanted bacteria growth like mold or mildew on the cabin air filter. This also increase the fuel consumption of the vehicle as the AC system has to work much harder to maintain the desired cabin temperature. ![]() If the air conditioning system in H3 is not blowing hard enough or has weak airflow due to clogged cabin air filter, it negatively affects the cooling performance as less air gets pushed through the evaporator coil. When the cabin air filter gets dirty, the blower motor will struggle to push large amount of air though the system and the airflow from the AC vents is reduced. This not only protects the blower motor, evaporator, and the heater core from dust and debris, but also improves the quality of air in the interior of the vehicle. ![]() When the blower motor in H3 sucks air from the interior or fresh air from the outside (depending on your setting), it first goes through the cabin air filter. ![]()
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