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Car Forum / BMW Cars / December 20042004 BMW 525i- why windows fog? have it set automatic- w/refresh air
Hi, I just bought a brand new 2004 BMW 525i- the car runs perfectly - however, the other night, while driving, (it was not raining) when I started the car up and began to drive, the drivers side window and the rear passenger side window began to fog up, also the back window. I have the climate control set to 72 degrees and it is in the automatic mode. (I am located in New England) I remember reading somewhere in the BMW literature that it stated that if you have it set to automatic, the windows would most likely never fog up. If I have the climate control set to automatic, should the window fog up? please advise- being that the car runs in the 50$$K range, I figured that foggy windows would be solved. Also, I realize that if the windows do fog up I can hit the blower- that does solve the problem on a temporary basis, when I shut it off, its foggy. KOS "KOS" <computerstuff2@excite.com> wrote > Hi, I just bought a brand new 2004 BMW 525i- the car runs perfectly - > however, the other night, while driving, (it was not raining) when I [quoted text clipped - 9 lines] > blower- that does solve the problem on a temporary basis, when I shut > it off, its foggy. If it was a cold night (or day FTM), say below 40 F, the a/c doesn't really work to defog windows due to two facts: 1) it won't de-humidify the air because it can't get cold enough (below 40), and 2) it often goes into re-circulation mode if the engine and cabin are too cold to effectively heat outside air. No car's HVAC can do any better. However, I advise cracking the sunroof or window to help exhaust humid air, not using automatic mode, manually selecting exterior air, and using the defrost mode, which runs the fan at high speed. Floyd Switch the AC on to get rid of fog on the inside of the windows. Do NOT blame the weather on your car. You paid extra for a car with no leaks and wind whistles. Your hot breath mixed with moist, cold air will cause fog to form on the inside of the window. Set the Temp controls for 72, or wherever you like, and switch the AC on. The AC will dry the air, and the fog on the windows will go away. > Hi, I just bought a brand new 2004 BMW 525i- the car runs perfectly - > however, the other night, while driving, (it was not raining) when I [quoted text clipped - 11 lines] > > KOS > Switch the AC on to get rid of fog on the inside of the windows. > [quoted text clipped - 19 lines] > > > > KOS With the 2004 BMW 525i- when you have the climate control set to automatic, it automatically turns the AC on and off- so, to your point of turning on the AC, it goes on automatically in that particular mode.- It senses humidity- the manual states that in the auto mode- the car will not fog due to the fact that the ac kicks on automatically > > Switch the AC on to get rid of fog on the inside of the windows. > > [quoted text clipped - 38 lines] > mode.- It senses humidity- the manual states that in the auto mode- the > car will not fog due to the fact that the ac kicks on automatically But you said that the windows fog up in the Auto mode. This means you need to set the controls manually when you first get in the car. My experience has been that you may need to set the controls manually for the first 20 minutes or so, then you can set them back to auto. That would be surprising in a BMW. In my other-premium-German-brand-car-with-three-pointed-star-on-the-bonnet the automatic climate controls blows up a gale when first starting up on cold, no doubt to clear any fog that forms as soon as steamy old me gets into the car. DAS  SignatureFor direct contact replace nospam with schmetterling --- [...] > But you said that the windows fog up in the Auto mode. This means you need > to set the controls manually when you first get in the car. My experience > has been that you may need to set the controls manually for the first 20 > minutes or so, then you can set them back to auto. A lot of US cars will automatically turn AC on when defrost is selected. This is specifically intended to dry the air prior to heating it to help with defog. Even if your bimmer is smart enough to turn on AC for temperature control (my E39 isn't ... it's surprisingly unsophisticated for a $40-50K car), it probably isn't when temps are low, inside humidity high and there is no apparent need to turn the compressor on. SO ... manually select the AC while in the defrost mode and you'll rapidly clear your windows of fog. R / John >> Switch the AC on to get rid of fog on the inside of the windows. >> [quoted text clipped - 38 lines] > mode.- It senses humidity- the manual states that in the auto mode- the > car will not fog due to the fact that the ac kicks on automatically > A lot of US cars will automatically turn AC on when defrost is selected. > This is specifically intended to dry the air prior to heating it to help [quoted text clipped - 4 lines] > select the AC while in the defrost mode and you'll rapidly clear your > windows of fog. Often times, you might want to direct airflow onto the windshield, Defrost, but not want the AC to blow. For example, some drivers like air to flow through the cabin, but do not like it in their face as happens through the Vent ducts in the dashboard; these drivers might want to select the control that sends air onto the windshield, and not condition the air in any way. Giving you the option of running the AC or not should not be considered a sign of unsophistication. Indeed, assuming you want the AC on simply because you have decided to direct airflow onto the windshield is rather unsophisticated, if you ask me. |
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