Do your windows fog up as soon as it gets cold? Here's what really helps, and when your car needs service

The first cold mornings often bring the same problem: the driver gets into the car, and within a few moments the windshield fogs up from the inside. Condensation occurs when warm, humid air in the cabin comes into contact with the cold glass. It's not just an inconvenience, because driving before all the windows are completely clean seriously reduces visibility, especially during the season of rain, fog, and early darkness.

The quickest response is to direct the air towards the windscreen, turn on the air conditioning and gradually increase the temperature. The air conditioning is not only for cooling: while it is running, it helps to remove moisture from the air. Recirculation should be switched off to allow outside air to enter the cabin, and with automatic air conditioning, the easiest way is to press the defogger control. The heated rear window and door mirrors, if fitted, should be switched on separately.

A common mistake is wiping the glass with a sleeve or a dirty cloth. This leaves greasy marks that further scatter the light from headlights and low sunlight when it fogs up again. The inside of the glass should be cleaned regularly with a product intended for car windows and a clean microfiber cloth. Anti-fog products can help, but they cannot compensate for poor ventilation or a permanent source of moisture.

Moisture often enters through very simple means: wet jackets, umbrellas, floor mats and shoes left sealed in the car overnight. Such items should be removed, rubber floor mats dried, and the cabin aired when conditions are safe. You should also check that the air intake openings are free of leaves and dirt. A clogged or long-unchanged cabin filter can reduce air flow, so it should be checked according to the vehicle's service schedule.

If your windows continue to fog up even when the cabin is dry, the problem may no longer be a seasonal occurrence. Damp carpet, a musty smell, water marks around the doors or trunk, and condensation that quickly returns may indicate water intrusion, poor drainage, a damaged seal, or a ventilation problem. In that case, constantly wiping the windows will only mask the symptom and your car should be inspected by a garage.

The practical rule is simple: the driver can clean the windows themselves, dry the interior, use the air conditioning properly, and check easily accessible openings and the condition of the filter according to the instructions. Dismantling the trim, cleaning deep drains, and searching for hidden leaks are better left to a service center. A few minutes of preparation before departure is a small price to pay for full visibility, and persistent moisture is a message from the car that should not be ignored.

Article prepared with the support of AI tools.