Reasons for Severe Odor in New Passat While Driving
2 Answers
Automotive interiors extensively utilize materials such as plastics, rubber, fabrics, paint coatings, insulation materials, and adhesives. These materials contain organic solvents, additives, and other components (including benzene, toluene, xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, and acrolein) that gradually release into the cabin environment during vehicle use, contributing to interior odors—particularly severe in new cars. Below are the related causes: 1. Damp Air Conditioning System: Condensation from rain, snow, or fog combines with airborne dust and adheres to the evaporator surface. The dark, damp corners of the AC system become breeding grounds for mold. Over time, turning on the AC releases a persistent musty odor. Neglecting regular AC system cleaning exacerbates the issue, producing an unpleasant sour or rotten smell when the AC is activated. 2. Decaying Matter in Hidden Areas: Forgotten fruit peels, sweets, or spilled beverages in cabin corners can rot and mold. Wet seats or carpets from leaks or rain also encourage mold growth. Shoes left unused in the trunk or unwashed clothes further emit foul odors. When the AC operates, these odors circulate and spread throughout the cabin. 3. Driving Habits: Individual habits extend beyond driving style and influence cabin odor. Eating, smoking, or cluttering the interior with items over time leads to natural odor buildup. Additionally, parking the car long-term in harsh environments—such as under direct sunlight, in shaded areas, or near garbage—aggravates odor development.
I recently encountered an odor issue while driving my new Passat, which I suspect may be caused by chemical emissions from the new car's interior materials, such as volatile organic compounds (VOCs) from plastics and leather adhesives. The smell becomes particularly strong when driving in hot weather, causing dizziness. I recommend starting with ventilation—opening the windows more to allow air circulation. The air conditioning system could also be the culprit; if the filter is dusty or moldy, it may produce a musty smell, so replacing it is worth a try. Additionally, new cars use fresh components during assembly, and some odor is normal when heated, but if it's too severe, it's advisable to visit a 4S shop to check for potential material quality issues. Health-wise, I remind everyone not to ignore this, as it may cause discomfort. Regularly cleaning the car interior, such as vacuuming or placing bamboo charcoal bags to absorb odors, can gradually improve the situation. Persisting with these methods for a few weeks has shown good results.
