Why does the windshield of my car freeze? Causes and solutions

Last updated of 4 April 2025 by Maxime de Prinel

The gel inside the windshield is a common problem in winter that can surprise many motorists. Find out what the causes of an always damaged windshield and solutions to remedy it can be.

What are the causes of frost inside a car?

1. Humidity in the cabin: this is the main cause of internal frost. This humidity can come from different sources:
2. Condensation: the hot and humid air of the cabin is condensed on the cold surfaces of the windshield, creating small droplets that freeze
3. Extreme temperatures: when the external temperature drops drastically, the windshield cools quickly, promoting the formation of frost inside.
4. Bad circulation of the air: if the air does not circulate correctly in the passenger compartment, the humidity remains trapped and increases the risk of frost.

The consequences of internal frost in a car:

• Reduced visibility : With an incorporated or frozen windshield, it becomes much more difficult to see the road, which increases the risk of accidents.
• Risk of late reactions : When it is difficult to see, we react less quickly to obstacles or dangers.
• Possible good : Driving in these conditions is often prohibited and can cost a ticket.
• Fatigue and discomfort : Forcing your eyes to see through a blurred or fruit windshield can quickly become exhausting.
• Danger to others : Pedestrians, cyclists or other cars … are more difficult to identify, which can be dangerous.
• Wear useless : The use of wipers on frost or humidity can damage them faster than expected.

What solutions to remove the frost on my car?

1. Reduce humidity in the passenger compartment:
   • Make sure your vehicle is waterproof
2. Improve air circulation:
   • Use air conditioning in dehumidification mode, even in winter
3. Use Anti-Fog products:
   • Apply an ancient product within the windshield
   • Place the dehydrating sachets in the car
4. Prevention:
   • Cover the windshield with a special coverage at night or even a box
   • If possible, park your car in a garage or under a refuge
5. In Gel Cas:
   • Use your car by directing the hot air on the windshield
   • Never use hot water to disintegrate or risk a thermal shock that can break the windshield
6. Regular maintenance:
   • Check your vehicle holding
   • Make sure your heating and ventilation system works correctly

By applying these solutions, you will considerably reduce the risk of internal frost on the windshield.