Why does the old Passat have a strong smell in the cabin?

[MacDavid]

If the old Passat has a strong smell in the cabin, it is recommended to check whether the car's air filter needs to be replaced. Delayed replacement of the air filter may lead to strong odors inside the car. There are many reasons for the heavy smell of exhaust in the cabin of an old car. It could be that with the windows closed, the external air circulation is turned on, causing exhaust fumes to enter the cabin. There might also be a leak in the engine's emission system. Additional information: If the car is equipped with an exhaust gas recirculation system, it could be due to abnormal operation of this system. Another possibility is poor sealing of the car's weatherstripping, or engine operational faults that require related inspections.

[BrandonRose]

I've driven an old Passat, and the strong odor in the cabin is often due to the vehicle's age, where interior materials like plastic, rubber, and carpeting degrade, releasing that unpleasant chemical smell. I've personally seen the dashboard and seat padding break down, emitting volatile compounds, especially noticeable on hot days. Additionally, the AC evaporator is prone to mold or condensation buildup, breeding bacteria that blow out a musty stench. You need to regularly disassemble and clean the evaporator and air ducts, replacing the cabin air filter. Also, check for any engine oil or coolant leaks into the cabin—these fluids produce even stronger odors. I recommend ventilating the car by opening windows for a few minutes before driving and wiping down the interior with a neutral cleaner to significantly improve air quality and prevent long-term health risks. Never skimp on maintenance, or that smell will drive you crazy.

[LaChristian]

Hi, as a car enthusiast, I've found that the musty odors in older Passat cabins often originate from issues with the AC system. The evaporator retains moisture after AC operation, and once mold develops or stagnant water blocks the ducts, the air blown out carries a mildew smell, reminiscent of damp clothes left un-dried. Several times, I encountered this due to clogged condensate drain pipes. It's advisable to inspect the cabin air filter quarterly and replace it promptly if dirty – preferably with activated carbon filters to prevent odors. Also, check for rainwater ingress or spilled liquids inside the car, as residual food or cigarette ash can accumulate and ferment. Remember to use the fresh air mode more often while driving to reduce interior humidity. Regular professional deep cleaning is affordable but ensures a more comfortable and worry-free driving experience.

[LukeRose]

I just find that smell quite unpleasant, probably due to poor hygiene in the car. For example, cigarette stains or pet hair left by the previous owner may accumulate in the seat seams and rot, causing the odor to spread. Older cars often use cheap materials that age quickly, and plastic parts can emit pungent odors when decomposed by sun exposure. My suggestion is to start with the basics: use a vacuum cleaner weekly to clean the carpet corners and spray antibacterial spray; check if the door seals are aging or cracked, as external odors can easily seep in. If the smell is musty, it's likely that the air conditioning system hasn't been cleaned properly, which is most prone to issues in summer. Don't delay—prolonged exposure can harm respiratory health. Get cleaning as soon as possible.

[CaliLee]

Having driven for decades, I believe the unpleasant odor in the old Passat's cabin is often caused by inadequate ventilation. The air conditioning fan or air intake may accumulate dust or be blocked by leaves, preventing fresh air from entering and allowing stale air to circulate and accumulate. I've experienced aging seals with gaps that let in moisture on rainy days, worsening the musty smell. It's also important to check for signs of fluid leaks, such as oil or coolant from the engine compartment seeping into the cabin. The solution isn't difficult: clean the AC ducts and fan blades yourself, replace the air filter to maintain airflow, and don't overlook contamination from worn interior materials—regular spray disinfection can help keep things fresh. Simple DIY fixes can solve big problems; don't let minor issues affect your driving pleasure.