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A mechanic warns: Car air conditioning can hide bad odors, fungi, and strained parts if the driver ignores 5 simple care tips that make a difference in heat, cold, and even on long trips.

Written by Fabio Lucas Carvalho

Published on 08/06/2026 at 20:38

Automotive

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Frequent use even on cold days, ventilation before turning on the system under strong sun, attention to the recirculation button, and semi-annual cabin filter replacement are among the recommended care to preserve the automotive air conditioning and avoid problems in daily use.

The car’s air conditioning requires correct use and preventive maintenance to avoid excessive strain on parts and bad odors. Five precautions help preserve the system on hot, cold days and long trips.

Frequent use preserves the car’s air conditioning

The equipment should be activated on cold days. This habit prevents the hoses from drying out and keeps the system lubricated, reducing the risk of technical damage.

Hot air should exit before activation

When the car is parked under strong sun, it is recommended to open the windows before turning on the equipment. The initial circulation allows the hot air to exit the cabin.

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Recirculation should be used with attention

The recirculation button helps block external air in places with dust, bad odors, or other unpleasant conditions. Despite its usefulness, continuous use is not recommended.

Without the renewal of external air, circulation inside the vehicle becomes limited. On long trips, this can promote drowsiness and facilitate the transmission of respiratory diseases among occupants, such as colds and flu.

Preventive maintenance avoids bad odors

The bad odor when turning on the air conditioning may indicate the presence of fungi and bacteria in the cabin filter. Replacing the filter is recommended every six months.

It is also necessary to keep the system clean and lubricated. These precautions preserve compressors, condensers, evaporators, and parts related to the equipment’s operation.

Those who have had problems with the car’s air conditioning, noticed bad odors, loss of efficiency, or frequently use recirculation on long trips can share their experiences in the comments. Sharing stories helps other drivers identify signs before the system presents major failures.

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A mechanic warns: Car air conditioning can hide bad odors, fungi, and strained parts if the driver ignores 5 simple care tips that make a difference in heat, cold, and even on long trips.

Frequent use even on cold days, ventilation before turning on the system under strong sun, attention to the recirculation button, and semi-annual cabin filter replacement are among the recommended care to preserve the automotive air conditioning and avoid problems in daily use.

Frequent use preserves the car’s air conditioning

Hot air should exit before activation

Recirculation should be used with attention

Preventive maintenance avoids bad odors

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A mechanic warns: Car air conditioning can hide bad odors, fungi, and strained parts if the driver ignores 5 simple care tips that make a difference in heat, cold, and even on long trips.

Frequent use even on cold days, ventilation before turning on the system under strong sun, attention to the recirculation button, and semi-annual cabin filter replacement are among the recommended care to preserve the automotive air conditioning and avoid problems in daily use.

Frequent use preserves the car’s air conditioning

Hot air should exit before activation

Recirculation should be used with attention

Preventive maintenance avoids bad odors

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Workers were opening a modern road in Dover when they found, 6 meters below the asphalt, a 3,500-year-old boat made of stitched oak and plant fibers.

Dissatisfied with seeing people sleeping on the street, a man named Ryan Donais started building small mobile homes so that homeless people can escape the cold, each equipped with a bed, running water, electricity, and heating.

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