Defogging and visibility
Fogged windows reduce visibility and increase risk. With the right sequence you can clear the glass quickly and keep it clear.
Quick defog sequence
| Step | Action | Why |
|---|---|---|
| 1 | Max defog/defrost mode | Full airflow to windshield |
| 2 | A/C ON | Dries the air fast |
| 3 | Temperature to warm | Increases evaporation |
| 4 | Fan high | Moves moisture off glass |
| 5 | Rear defog ON | Clears rear quickly |
If equipped, use heated windshield. Avoid recirculation while defogging.
Prevention
- Keep glass clean, inside and out
- Remove snow and slush from floor mats
- Air out the cabin regularly
- Use A/C periodically year‑round to keep the system dry
Troubleshooting recurring fog
| Symptom | Likely cause | Fix |
|---|---|---|
| Fog returns after a minute | Wet mats, damp clothes or pets releasing moisture | Vent the cabin, dry textiles and review Preparing for a long drive for packing tips |
| Fog builds high on the glass | Vents point too low or are partially closed | Aim vents at the upper third of the windshield and confirm seating position |
| Fog appears when trucks pass | Pressure drop draws humid air up from the cabin | Enable auto climate or temporarily raise fan speed |
| Fog lingers on rear side glass | Limited airflow with passengers in the back | Open rear vents and ask passengers not to block outlets |
Persistent fog can signal a technical issue:
- Inspect the pollen filter and A/C output. See Climate control and cabin air quality .
- Confirm the rear window heater warms up; if it stays cold, check fuses. Read 12V battery maintenance .
- Notice musty smells? Air the car and inspect door seals. See Technical safety check .
Long daily commutes pair well with Merging and queue driving so you can stay calm while adjusting settings.
Common mistakes
- Recirculation ON in humid weather
- Turning A/C OFF in winter
- Wet clothes and gear left in the cabin