What Causes Bad Odor Inside the Car?
3 Answers
Reasons for bad odor inside the car: 1. The extensive use of plastic, rubber, and other materials in car interiors. The organic solvents and additives in these materials gradually release into the cabin environment during vehicle use. This is one of the main causes of unpleasant odors inside the car, especially in new cars. 2. Odor caused by the cabin air filter. Many car owners report a sour, musty smell blowing out when the air conditioning is turned on, which is quite unpleasant but tends to fade after a while. In fact, this odor is a sign that the cabin air filter needs replacement, as it has become moldy due to bacterial decomposition. Replacing the filter will alleviate the odor. 3. Odor caused by the evaporator core. If the odor persists after replacing the cabin air filter, the issue likely stems from the evaporator core. Mold growth inside the evaporator core cannot be resolved by simply changing the filter; instead, cleaning the evaporator core and air conditioning ducts is necessary. 4. Lastly, individual habits vary not only in driving but also in car usage. Differences in how the car is used can also lead to unpleasant odors, such as eating or smoking inside the vehicle, which naturally causes odors over time.
I've been driving for over 20 years and have encountered odor issues in my own car, most of which were caused by the air conditioning system. The evaporator produces condensation after cooling, which over time breeds mold and causes odors, especially during the rainy season. Sometimes food debris falls under the carpet and rots, or pets urinate on the back seat and aren't cleaned up promptly. To solve these issues, a comprehensive inspection and cleaning of the air conditioning evaporator are needed, using specialized sprays to thoroughly clean the ducts. Additionally, removing the carpet to dry and disinfect it is essential. With regular maintenance, these odors can be resolved. If left untreated, the problem will worsen, and bacterial growth can be harmful to health. It's advisable to find a reliable repair shop to handle the issue properly—spending some money for a fresh driving experience is worth it.
As a homemaker, I'm particularly sensitive to odors inside the car. When traveling with children, food crumbs falling into seat crevices can mold and produce a sour smell. Another common situation is pet hair and urine residue, especially in areas where dogs have sat, as bacteria multiply quickly. I recommend first thoroughly inspecting hard-to-reach areas in the cabin, removing seats for vacuuming and deep cleaning the upholstery, then disinfecting with vinegar water or professional antibacterial spray. Meanwhile, keep windows ventilated for dryness. If the AC emits a musty smell, replace the filter promptly. After several such treatments, odors should mostly dissipate. The key is developing good habits, like cleaning car clutter weekly.
