What Causes Excessive Humidity Inside the Car?

[ColinAnn]

Water vapor condenses into small droplets, which disappear when the air vents are adjusted to the defrost position. 1. Causes: Due to slightly colder outside weather and relatively higher interior temperature, the moisture inside the car condenses upon contact with cold surfaces. 2. Solutions: (1) Place desiccants. (Opt for car-safe desiccants with strong moisture absorption, avoiding hazardous calcium chloride-based products.) (2) Use activated charcoal. (3) Turn on the AC cold air during rainy days to effectively defog and dehumidify. (4) Open windows frequently for ventilation.

[OReese]

I've been driving for decades and have encountered many instances of a damp car. The most common causes are aging or cracked door seals, or windows not being fully closed, especially during rainy days when moisture seeps in. Another issue is when the air conditioning is set too cold, causing the evaporator to condense and the drain hole to clog, allowing moisture to flow back into the car. Additionally, leaving wet items inside, like a wet umbrella or sports gear, can turn the car into a steamer. It's advisable to regularly check if doors and windows are properly sealed and clean the drain holes periodically. When using the AC, avoid blasting the coldest setting directly—auto mode is better. Oh, and in high-humidity areas, placing bamboo charcoal packs can help absorb moisture, keeping the interior dry and making driving more comfortable.

[Briana]

As a young car owner, I often encounter the issue of excessive humidity inside the car. The most annoying part is when rainwater leaks through the door seams after each rain, or when I forget to close the windows and the interior gets wet and starts smelling musty. Another issue is poor air conditioning habits, like always using recirculation mode and forgetting to ventilate, which causes moisture to accumulate. Leaving wet umbrellas on the seats is also a trigger. I recommend keeping some dehumidifiers in the car and leaving the windows slightly open for ventilation when parked. In the morning, turning on the heater for a while can solve most humidity problems. The key is to develop good habits and not be lazy—this way, driving becomes much more pleasant. Otherwise, that sticky, damp feeling is just unbearable.

[LaRichard]

I usually enjoy delving into car details. The main cause of moisture inside the car is a clogged drain pipe during the dehumidification process of the evaporator, which prevents the moisture from escaping and flows back into the car. Additionally, water leakage due to poorly sealed doors or sunroofs is also common. Poor vehicle ventilation, such as keeping windows closed for long periods, can exacerbate the issue. It is recommended to regularly clean the drainage system or install rain guards to improve ventilation. A simple dehumidification trick is to open the windows for a few minutes after parking to allow air exchange. This helps maintain a dry, comfortable, and mold-free environment.

[LeAlexis]

I feel very uncomfortable with the dampness inside the car, especially after bringing in wet raincoats or sports shoes, which makes it worse. Common causes may include incorrect air conditioning settings, such as not turning on the external circulation, leading to moisture retention; or aging window seals causing leaks. It is recommended to check the body gaps and use bamboo charcoal bags to absorb moisture; manually adjust the airflow when using the air conditioner to avoid direct cold drafts. A dry car interior is beneficial for health, preventing allergies and odors. Before parking, open the windows to ventilate and then leave.