Reduce moisture sources inside the cabin

Excess moisture in the cabin is the root cause of interior fogging. Eliminating moisture sources prevents the problem before it starts, reducing dependence on climate controls.

Why It Works

Fog forms when humid cabin air contacts cold glass. Every wet item, breath, and leak adds moisture. Removing these sources keeps humidity low enough that fog rarely forms.

Steps

1. Check door and window seals for cracks or gaps that let rainwater seep in.
2. Dry wet floor mats regularly, especially in winter when snow and slush accumulate.
3. Remove wet items like umbrellas, coats, and boots rather than leaving them in the car.
4. Crack a window briefly when the car is full of passengers to vent exhaled moisture.
5. Avoid recirculation mode in damp or cold conditions, since it traps cabin moisture.

Tips

• A small silica gel dehumidifier bag on the dashboard absorbs excess moisture overnight
• If fogging is persistent and unexplained, check for a leaking heater core, which releases coolant vapor into the cabin