Condensation Inside Car: The Effective Ways To Stop This!

Condensation inside car is not only pesky but also expensive too if you don’t know the right solution.The colder seasons – from autumn to winter – are annoying to too many people because of the dampness of the outside world. 

It becomes frustrating when that same problem sneaks inside our four-wheeled friend! 

Condensation Inside Car: Why Does It Happen?

If you want to remove moisture from car, you have to know what causes it in the first place. Warm and humid air gets condensed after coming in contact with a cool surface. 

When the weather is cold, the warm breath of the driver and passengers meets the cold windshield and window glasses and gets condensed. It can also happen if there is already something damp in the car that gets heat from sunlight. 

Without a ventilation system, the moisture can’t escape and turn into thick mist and water when it touches the glass surface.

Here is a summary of some common reasons for the condensation formulated inside cars:

  • Wet shoes, wet clothing, wet umbrellas, and even wet dogs! 

When you get inside your automobile when it’s raining outside, the moisture on your clothes, shoes, and other belongings evaporates into the air as they dry. 

Carpets and chairs may collect water from your shoes and clothes, allowing the moisture to escape into the air.

  • Breathing – every time you breathe, you expel water vapor.

The more time you and your passengers spend in the automobile, the more moisture you breathe into the cabin.

  • Water ingress – aging or faulty seals can occasionally allow water inside the vehicle.
  • No fresh air circulation – the longer the air sits in the automobile, the more humid it might get.
how to get moisture out of car
Moisture condensation inside the car is an annoying problem during the cold months. (Photo:

How To Get Moisture Out of Car

Following the tricks below will help you stop condensation in your vehicle:

1. Turn the Defrost Button ON

It’s the easiest way to keep the vehicle moisture-free. It will switch on both the heat and the AC systems. 

The AC will clear up moisture from the air and the heating system will keep the interior comfortably warm.

2. Create a Passage for Ventilation

If it’s a sunny day or the weather is warm, leave a couple of windows slightly open while driving. It will keep the interior warm and create a passage for the moisture to get outside. 

However, don’t make the mistake of keeping the windows open at night. It will make the windshield hazy with dew.

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3. Keep Everything Close on Wet Days

The rainy days are the worst for creating condensation inside car. So, don’t leave the windows or the sunroof open on these days. It will let moisture in and make all the surfaces foggy.

4. Discard all the Wet Items

Leaving damp or wet items such as shoes, clothes, floor carpet, and other things inside is one of the main reasons for condensation inside car

As you already know the cause of foggy glass surfaces, you should remove every source of moisture to keep the glasses clear.

remove moisture from car
There should be nothing wet or damp inside the vehicle. (Photo: Armor All)

Check for coolant leaks and other types of discharge from the vent system, windows, or sunroof. Repair and seal the leaks because these damp things will create moisture, which will then transform into fog.

5. Turn off the Recirculation Valve

Your car certainly has this valve if it has an air conditioning system. Nevertheless, many people don’t have a clue about its position. 

Well, look for a switch featuring the picture of a C shape with an arrow or a person getting hit in the face by an arrow. 

It does the job of recycling the inside air and recirculating it. You have to switch it off to allow dry air in from outside and remove the indoor moisture.

6. Using Rain X or Shaving cream

Using Rain X or Shaving cream is also a good tip to stop condensation inside car.

7. Look for any Leak

Condensation might also be caused by leaks that have accumulated over time in your vehicle. Mist can form anywhere, from the heater matrix to the doors and the sunroof seal.

However, if your vehicle does have a leak, determining the source of the leak might be tricky. This is where a skilled technician may assist.

Be warned that finding a leak may require completely disassembling a vehicle, which may be costly, especially if your vehicle is old. Older vehicles are more prone to leaks, and a leak is more likely to emerge after six or seven years.

condensation inside car overnight
Older vehicles are more prone to leaks. (Photo: Aviva)

How To Prevent The Condensation Inside Car In A Long Term

Condensation would be completely avoidable in an ideal world, and we wouldn’t have to bother about defrosting or defogging our automobiles in the morning. 

Unfortunately, such is not the case, making it crucial to understand how to deal with foggy windows. But with a few simple steps, you can reduce condensation or perhaps stop it altogether.

Park your car in an underground garage or indoor lot

Although hardly everyone has access to one, parking in an underground garage or indoor lot is the only surefire way to completely eliminate moisture. 

Even if you can’t park indoors every day, attempt to do so if you know you’ll be in a hurry or have a crucial function to attend to so that you won’t worry about defrosting your windows in the morning.

Cover your car with thick and high-quality covers

If you can’t park inside during the winter, how can you prevent moisture on inside of windshield

A fantastic idea is to use a vehicle cover. They can aid in maintaining the surface temperature and avoiding the formation of condensation inside car overnight.

Leave out wet objects from cars

Objects that are wet, such as wet towels, wet garments, wet shoes or boots, or wet umbrellas, can lead to condensation inside car or on the windows and other surfaces.

Ventilate the vehicle

After lengthy journeys or after keeping your vehicle parked for an extended period of time, open the windows and doors to let fresh air flow through the inside. 

This will assist in removing any moisture that has accumulated inside the car.

condensation on inside of car windows when parked
Sometimes, open the windows and doors to let fresh air flow through the cabin. (Photo: Bob Vila)

Get a dehumidifier

Consider using a dehumidifier to keep the air inside your car dry and lessen the amount of condensation that collects if you don’t have access to a garage or carport.

FAQs on Condensation Inside Car

  1. Is it true that new automobiles are more prone to condensation buildup?

Modern vehicles have significantly superior seals, making them more watertight. This makes any damp air trapped within the car more difficult to leave. Moisture levels will decrease if movement is induced using a fresh air source.

Increased insulation also helps contemporary automobiles to stay warmer after being parked; the longer the air inside the vehicle is warmer than the air outside, the more condensation will form on the vehicle’s chilly windows.

  1. How do cars get damaged by condensation?

Water that accumulates on windows over time may cause seals to fail, allowing water to leak through onto important electronics and into the inner metal of your car, where it will rust and corrode. 

Additionally, moist interiors can cause mold growth, vinyl to crack, leatherwork to fall apart, and more.

  1. Can condensation come from a car AC?

The system removes humidity from the air to chill the cabin, but that moisture needs somewhere to go! 

Technically speaking, the evaporator core of the air conditioner condenses (makes a liquid out of) the humidity. 

The liquid then uses the evaporator drain to leave the vehicle and land on the pavement. A few drips are typical, but a puddle is not!

  1. Is condensation in a car better off with hot or cold air?

Make sure the air conditioner is on. Use the heating in addition to the air conditioning. 

You should also keep the environment inside dry. Hot air will evaporate some moisture off the glass and then cool and condense on the glass again.

  1. Can a leaky automobile be caused by condensation?

Condensation from the air conditioner or exhaust is typically to blame for your car’s leak, which is most noticeable at the back of the vehicle. These two different leaks are both typical.

Check out this video from ChrixFix to learn more about how to stop condensation in car windows!


We have just scrolled through some notices on ways to stop and prevent condensation inside car. Hope you find this piece of information insightful and see you again with more updated maintenance tips from Car From Japan.