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 Electrical system: fuses and fault-finding.
- 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