Woman Suffers Dizziness and Nausea from Not Replacing Car's Cabin Air Filter

A Texas woman experienced persistent dizziness and nausea after driving a car whose cabin air filter had reportedly never been replaced. In a video, she showed the removed filter, which contained debris such as leaves, and said she noticed a foul odor every time she activated the windshield washer fluid—suspecting it was linked to the long-unreplaced filter. The cabin air filter is located within the vehicle’s HVAC (heating, ventilation, and air conditioning) system ductwork and filters outside air entering the cabin, trapping pollutants like dust, pollen, mold, bacteria, smoke, insects, and rodent droppings. According to relevant authorities, failing to replace the filter regularly can lead to allergies or respiratory irritation, with common symptoms including sneezing, runny nose, headaches, blurred vision, and dizziness. Most automakers recommend replacing the cabin air filter every 15,000 to 30,000 miles, though drivers should consult their vehicle’s owner’s manual for specific guidance. Replacement intervals should be shortened when driving in dusty, high-pollen, or heavily polluted areas. The replacement process typically requires no tools, takes less than 15 minutes, and costs between $15 for basic aftermarket filters and over $50 for OEM parts.