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Why is My Windscreen Freezing on the Inside?

Posted on 27th September 2023
Why is My Windscreen Freezing on the Inside?

With frosty mornings creeping in on us, we are starting to prepare ourselves with de-icer and an extra ten minutes in the morning routine.

Most of us will experience frost on the outside of our cars, but when its on the inside, it can be a real pain. It is normally caused by condensation building up when it rains.

It happens when the temperatures inside and outside of your car are different. This is especially true in new cars, or cars with a sunroof.

This said, condensation affects all vehicles, and we have all likely experience a frozen windscreen at some point. Newer cars may be better insulated and sealed which means humid air cannot move outside.

It is difficult to keep a windscreen completely free of moisture and condensation. However, there are some things you can do to reduce the amount of moisture in your car.

Why has my windscreen frozen on the inside?

Frozen windscreens occur when humid air inside your car comes into contact with a cold surface, like a window in winter months. This can produce fog or frost which disrupts the view from inside your car.

In the coldest months, this can even freeze, making it especially difficult to get rid of. It is illegal to drive with your windscreen in this state.

Keep your windscreen clean

In general, a key way to prevent frost on your windscreen is to keep your windscreen clean as this can slow down buildup of frost on your windscreen. Dirt particles attract moisture which can only worsen the problem.

One at-home hack for preventing your windscreen from freezing is to wipe your windscreen with white vinegar once a month. While it might not smell the best, this can be highly effective. Because white vinegar is not greasy, it will discourage moisture from clinging to your windscreen, more so than marketed windscreen wipes

Circulate air inside your car

Your car needs a circulation of fresh air regularly to stop frost on the inside. If we are not using our cars regularly, this can be the cause.

Car features

The best way to remove moisture from the air is with your car’s air con. Air con systems help moisture move out of your car and keeps the air inside your car refreshed. Make sure the setting is not just re-circulating the air inside your car.

Another thing you can try is to switch off the A/C and AUTO features of your car the last time you use it. Some cars will fog up instantly when the ignition is turned on otherwise. This said, when you get back in your car, put it back on to keep the air dry for next time.

How can I prevent my windscreen freezing?

The first thing most drivers will do when their windscreen is frozen is put their demisters on full. This does dry your windscreen eventually but try blowing colder air at your windscreen at first. It is more effective to slowly increase the temperature on the windows.

Remove any damp items from your car like towels or spare clothes. As they dry, the moisture in the air will contribute to condensation.

Open windows when safe

You can leave the front windows open a little, if your car is in safe place like a garage or private road. This gets fresh air into the car and reduces condensation. This may only be necessary for a few hours at a time.

Absorb excess moisture

Another method is to buy de-humidifiers – they are like the tiny silica gel bags you get with new clothes and other items.

If you’d rather save money, you could save silica packs up and dot them around your car instead. Most of us will have them lying around the house somewhere.

Another tip circulating the internet is cat litter in a pair of tights. The clay in cat litters works very well as a de-humidifier. So, if you’re a feline lover, that this can be worth a try.

Keep a cloth that is designed to absorb moisture in your glove box. This is helpful when you get in your car and need to quickly resolve the issue from the inside.

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How can I stop my car freezing on the inside FAQs

Preventing your car from freezing on the inside during cold weather is important for your comfort and safety. Here are some frequently asked questions (FAQs) and answers on how to stop a car from freezing on the inside:

Why does the inside of my car freeze in the winter?

The inside of your car can freeze in the winter due to a combination of factors, including cold outdoor temperatures, humidity inside the car, and condensation. Moisture inside the car can freeze on windows, creating frost or ice.

How can I prevent frost or ice from forming on the inside of my car windows?

Use a moisture absorber: Place desiccant bags or moisture-absorbing products inside your car to reduce humidity.

Leave windows cracked: Slightly crack open a window to allow moisture to escape.

Use window covers: Covering your car windows with insulating material or frost shields can help prevent frost build up.

Keep the interior dry: Avoid bringing wet items into your car, like snow-covered boots or damp clothing.

What should I do if my car windows are frozen on the inside?

Warm up the car: Start your car and let it run with the heat on to gradually warm up the interior. Use the defroster to help melt the ice.

Scrape the ice: Gently scrape the frost or ice from the inside of the windows using a plastic ice scraper or a credit card (be careful not to scratch the glass).

Wipe with a cloth: Use a dry cloth or paper towel to wipe away any remaining moisture.

Can I use an antifreeze product inside my car to prevent freezing?

It is not recommended to use traditional antifreeze (ethylene glycol) inside your car, as it is toxic and can release harmful fumes. Instead, use moisture-absorbing products or methods mentioned in question 2.

How can I keep the car’s interior warm?

Use a car heater: Turn on your car’s heater to maintain a comfortable temperature.

Check the weatherstripping: Ensure that the weatherstripping around your car doors and windows is in good condition to prevent drafts.

Should I cover my car with a tarp or car cover to prevent freezing inside?

Using a car cover can help protect your car from snow and ice buildup on the exterior, but it may not necessarily prevent interior freezing. However, it can reduce the amount of moisture that gets inside the car.

Can I use a space heater or electric blanket inside my car to keep it warm?

While it’s possible to use a portable electric heater or blanket inside your car, exercise caution. Make sure the heater or blanket is designed for automotive use and never leave it unattended, as it can pose a fire hazard.

What else can I do to prepare my car for winter?

  • Check your car’s antifreeze/coolant levels.
  • Replace old wiper blades.
  • Ensure your tires have adequate tread and are properly inflated.
  • Carry a winter emergency kit, including blankets, a flashlight, and non-perishable snacks.

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