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Bad smell coming from AC in car? Don’t worry, you can get rid of it with this simple trick at home.
Samira Vishwas | May 12, 2026 4:24 AM CST

  • AC in a car is its most essential feature
  • Strange smell from car as soon as AC is switched on
  • Pay attention in time otherwise it will affect your health

Car Maintenance Tips: During summer days, AC in a car becomes its most essential feature. However, it often happens that as soon as the AC is turned on, a strange and foul smell can be emitted from inside the car. This problem is quite common; However, if not addressed in time, it can cause problems for both your health and your vehicle. But what are the exact causes and what remedies can fix it. Let’s find out.

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Bad smell due to dirty AC filter

In most cases, the root cause of this bad smell is dust, moisture or bacteria accumulated in the AC system. The AC system of a car is equipped with a ‘cabin air filter’, whose function is to prevent outside dust and debris from entering the car. Over time, these filters begin to accumulate dust, dirt and moisture. Due to this accumulated dirt, bad smell starts to arise over time. If you notice an unpleasant odor when the AC is running, the first step you should take is to check the cabin air filter. Clean or replace it as necessary. Generally, it is considered important to replace this filter after every 10,000 to 15,000 kilometers.

Bacterial growth due to moisture

Often people do not turn off the AC immediately before turning off the car. This leads to accumulation of moisture in the AC system and creates a fertile environment for the growth of bacteria and fungi. Due to this very reason, there is often a foul smell when the AC is switched on. To avoid this problem, switch off the AC 2-3 minutes before stopping the vehicle and keep only the fan on. This helps to dry the moisture inside the AC and consequently reduces the odor problem.

Vents must also be cleaned

Dust and faeces accumulate inside the AC vents of the car as well. If they are not cleaned for a long time, this accumulated dirt can spread bad odor and cause allergy problems. Hence, it is very important to clean the AC vents at regular intervals. You can also opt to use an AC cleaning spray; This helps to get rid of odors instantly and keeps the air inside the car fresh.

Ignoring the problem for too long can be costly

If you constantly feel bad odor coming from the AC and you continue to ignore it, the cooling capacity of the AC can be adversely affected over time. In many cases, leakage of refrigerant or accumulation of dust on AC coils are the root causes of this problem. Hence, it is imperative to get the AC serviced at regular intervals. Keeping the car AC clean and in good condition makes your journey pleasant and also protects your health.

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