why is my windshield fogging up in the summer and how to prevent it

When your car has been sitting in the sun for hours, windshield fogging up can be a real irritant. There are several causes for windshield gaskets to deteriorate, including UV-related fading and ozone. This is why you need to take extra care to protect these sensitive pieces of rubber from wear and tear through proper maintenance.


The best method of combating windshield fogging up is to keep it from happening in the first place.    

Do not wait until your car’s temperature gauge nears overheating before turning off the engine. A majority of the heat is absorbed by the engine, but some heat leaks into the cabin causing the moisture on your windshield from condensation to turn into fog.    

Avoid running a car with a cold engine in an enclosed garage, as well as filling the tank before parking for long periods of time.

Let’s move forward ! In this post you will learn how to remove leaks from your windshield gasket or fogging. 


why is my windshield fogging up in the summer ?

A recap of the reason for fogging:

Condensation forms on the inside of the windshield through heat and moisture that is given off by the car’s interior or outside temperature.

The condensation then freezes in cold weather, which turns it into a thin layer of ice, hence causing the windshield to fog up. If your car gets parked in cold areas for long periods of time, beware that this freezing may start happening more frequently.

A leaky windshield gasket adds to the condensation, as it allows heat and moisture to pass through it.

Excessive condensation can lead to interior damage, and can make a car feel like an icebox in the winter. 

So, here’s how you prevent this from happening: Don’t allow freezing temperatures in your garage – if you leave your car in a garage overnight or on days when colder weather is expected, turn off the engine and set your climate control to air conditioning or heat mode.


In the summer, closing the garage door and opening up windows can help with the hot air wafting out of your car. If you want to keep your climate control on overnight, it’s best to set it to a higher temperature. This way, your windows are less likely to fog up when you open them in the morning.

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What the outside temperature does to car window condensation ?

The temperature outside directly affects the windshield of a car. According to the weather channel, the temperature of the outside is not only important for normal trips, but for parked cars as well. The inside temperature of a car actually affects it.

Temperatures below freezing will cause ice to build up on the inside window, while temperatures above 40 to 45 degrees Fahrenheit form mist. At these temps, rain and dew cause a lot of condensation.

When you start the car and the windshield is clear, your wipers will flick across the glass a few times to make sure it’s clean. This is because the wiper motor will not be able to get into action until there’s glass present. When the wiper hits some water droplets, the motor will turn on and wipe them away.

If your car doesn’t have wipers, look for an aftermarket product that fits onto your existing windshield.

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Do I need to replace my windshield ?

You can save quite a bit of funds by buying an aftermarket windshield (for better and affordable). Most of the companies come with one-year warranty. You may check for it on your own windshields and give your opinion about it.

The glass layers in windshields are not very thick, which makes them vulnerable to cracks, chips, or even breakage from collision. This can lead to serious damage to vehicles.

If you find a crack in your windshield, it’s important to contact a professional to get them fixed. It will take time to get the glass replaced and the car back on the road, but without fixing it right away, the repair could due more damage in the future.

However; if your windshield is done and you are happy with the new one, again, ensure you don’t leave it out in freezing temperatures. If it gets too cold outside, sit your car inside a garage to ensure that the windshield doesn’t crack anymore.

Furthermore, if your windshield is damaged by sun or water; drive it with caution until the damage is fixed up. If your car is on hold with a mechanic and you can’t drive it at all because of cracked glass, this can be an even bigger financial hit for you.

causes of windshield fogging:

There are a few reasons your windshield might be fogging up in the summer. One reason could be that the temperature inside your car is different than the temperature outside. When warm air hits cold glass, it can cause condensation to form, which can lead to fogging. Another reason could be that your car’s air conditioning system isn’t working properly. If moisture is building up inside your car, it can cause the windows to fog. Other reasons for window fogging may include: low gas tank, dirty or cracked windows, leaves on the window blades, lack of ventilation in your car (e.g., closed garage), or not enough antifreeze in your radiator. To prevent this problem from happening, you should make sure your vehicle has been running for at least 10 minutes before you turn off the engine. The heat will dissipate from the interior and reduce fogging on the windows. You should also keep an eye out for possible problems like dirt and debris accumulating on your windows because they can impede airflow, causing more moisture buildup.


  • Clear loose weather seals ,  
  • Have a mechanic take a look at your AC ,
  • Clean your interior ,
  • Use right soap, take amount of water and take right amount of shampoo then cleaning the interior of the car,

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How to prevent your windshield  from fogging up in the summer:

When it is hot, the water vapor in the air in your car condenses on your windows and forms a fog which can reduce visibility. You might be wondering how to stop this from happening. While there’s no definite substitute for an anti-fog treatment on glass,

Here these effective method to help to prevent this problem:

Open your windows and use the fan on your AC: While this will not completely solve the issue, it’s an important step to prevent air from condensing in your car. As a result, it will help to decrease the formation of fog on the windows and reduce airflow and considerably the chances of getting fogged up.

Temporarily turn off your air conditioner: If you’re using a running AC system in your car, especially if it’s a cold one as opposed to an auto transmission AC, you might want to turn it off for a while. When the vehicle’s interior is cool, it can take a long time for the air conditioning system to cool the air down to a comfortable temperature. Turning off your AC system for a while will help to stop the water vapor from condensing on your windows and reduce fogging up.

Keep your windows open all the way: This should go without saying, but making sure that your windows are clean and free of all debris will help to prevent any condensation, so make sure that you do this right away.

Keep the air flowing: Another thing that you can try to prevent condensation is to make sure that you’re not letting your car sit in one location for too long. This can cause the air inside the vehicle to cool down, which can contribute to fogging up. Make sure that you roll around your vehicle, especially if you’re trying to use your AC system.

Try using a water sprayer: Grab a spray bottle and fill it up with some water, but be careful not to overdo it, as this could make your windows very foggy. Just a few spritzes in front of the AC vents should do the trick. This will help to distribute the water vapor from the air throughout the car, preventing any condensation on your windows.

Try using a water sprayer: Grab a spray bottle and fill it up with some water, but be careful not to overdo it, as this could make your windows very foggy. Just a few spritzes in front of the AC vents should do the trick. This will help to distribute the water vapor from the air throughout the car, preventing any condensation on your windows.

Ventilate your car: Open up all the windows and let some fresh air in. The more ventilation you have, the less of an issue you’ll face with fogging up inside.

FAQ: why is my windshield fogging up in the summer

Q: What you can do if you’re not sure what’s causing your foggy windows ?

A: There are a lot of variables that could potentially be causing your windows to fog up and it’s hard to say without seeing your car or controlling the conditions.

But here’s the few reasons:

*Hot and humid weather

*Elevated outside temperature

*Low air pressure from your defrosting vents

*Low outside air temperature causing condensation on the inside of your windows/windshield

Q: How do I stop condensation on my car windows overnight?

A: Condensation on car windows can be an aggravating and common occurrence during the winter. While it’s not something that is clearly prevalent in the summer, it does still happen, albeit less often. To prevent this from happening in your car, there are a few things that you can do that will prevent water from getting trapped on your windows overnight.

One thing that you should do is make sure to clear off any extra water droplets or other residue before getting into your car at night.

Another thing that you can do is to change your car’s pre-heat on your heater to a more low or medium setting. For those with air conditioning, it is also recommended that you keep the temperature lower from the interior perspective as this will prevent condensation from forming.

Lastly, open all of your windows to maximize airflow in and out of the car. 

Q: How do you remove window haze from glass?

A:The haze on your windshield is caused by your car’s internal window defogger. A defogger is a type of heater that pulls moisture out of the air and cools it, causing evaporating moisture to create visible haze or fog. The best way to remove the haze from your windows is to manually turn on the defogger in order for it to run and then turn it off. Once you have done this for about fifteen minutes, you can close the windows so that air can circulate through them.

Here 4 step how to remove window haze from glass:

1. Place the window at an angle of about 20 degrees from horizontal.

2. Flip on the defogger for about 15-20 minutes. 

3. Close all of your windows and let the car sit for around 30 minutes.

4. Turn off the defogger and your window should be clear again now that you have let it “breathe” for a while.

Q: How do I reduce the humidity in my car?

A: Here few steps to reduce the humidity in your car:

1. Keep windows closed when you’re driving

2. Use a car dehumidifier or a water basin under your feet to drip water on the ground where it can evaporate

3. If possible, park at the bottom of a hill and allow gravity to help in your efforts

4. Prepare yourself by drinking plenty of fluids before entering humid conditions and taking frequent breaks to avoid feeling dehydrated

5. Never drive your car while it’s in a drenched condition

6. When you are at home, keep the windows closed and air your car by opening the windows, and try to keep the window open as much as possible when you’re not driving.

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