L John
Senior Member
- Joined
- Nov 24, 2013
- Messages
- 2,860
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- Location
- UK
- Your Mercedes
- W204 C350 Petrol Elegance
Please explain reason for your statement....
Try wearing glasses in a warm dry house, then go outside on a cold day when it's raining with an umbrella, do your glasses fog up?
No, even though it's likely around 97% humidity out there.
Now after some time, try going from the cold and rain into your house (possibly around 50% or lower humidity), your glasses will be pretty dry before you go in the house despite that high humidity outside in the rain, within seconds you won't be able to see because the glasses will fog up completely, and that's in the 'dry' house!
Dew point is what actually causes condensation to form. In this case it would be the combination of temperature of the air, temperature of the glass, humidity inside the car and dew point.
If the car has a good aircon system you could use recirculate to clear the windows but it's better to take cold air in from outside then heating it with the engine temperature even if it's just starting to warm up and drying it with the aircon.
So, recirculate is not a good option to clear the windows whatever the situation or weather.