Vibrating noises from the filter. When you hear vibrating noises, there’s usually one culprit. This is almost always a sign that it’s time to replace the cabin air filter.Click to see full answer. Likewise, what are the symptoms of a bad cabin air filter?Another symptom of a bad or failing cabin air filter is an unusual odor coming from the vehicle’s interior vents. An excessively contaminated filter may produce a dusty, dirty, or musty smell. The smell may become more pronounced when the air is turned on, and may make the cabin uncomfortable for the passengers. what happens when your cabin air filter is dirty? When your air filter is dirty, your engine is forced to work harder, resulting in poor fuel economy, higher emissions and, possibly, a loss of engine power. In turn, as a worst-case scenario, a clogged cabin air filter can lead to under-performance of the A/C system, causing weak air flow from the cabin vents. Also Know, what happens if you don’t change cabin air filter? If you don’t change your cabin air filter, the filter will become more clogged with dirt and debris and the efficiency of the filter and your car’s HVAC system will be compromised. The air volume into your passenger compartment will be continually reduced which will lead to the issue of foul odors inside your car.Can a dirty cabin air filter make you sick?The area where the filter is located can gather moisture, causing mildew & mold. If that filter becomes moldy and dirty it can be a direct cause of you and your family getting sick. Some vehicles do not have a cabin air filter, but it is best to check and be sure.