This fan noise is driving me crazy
06-27-2008, 02:15 PM
#11
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My Ride: G30 M550i
Model Year: 2018
Originally Posted by TexaZ3' post='611182' date='Jun 27 2008, 09:03 AM
Recirc with A is what BMW calls an Active recirc, meaning that the air is recirculated through some sort of carbon filter before entering your cabin.
In automatic ("A") mode, the car detects when there are pollutants present (which can cause an odor) and automatically switches things from outside air to recirculate (and back again when the pollutants are no longer detected.) This is the best setting to use since keeping it set to recirculate can cause a lack of oxygen (adding to driver fatigue) as well as an increased tendency for the windows to fog.
The only other real benefit to recirculate mode is that sometimes the car will cool down faster if you're runinng max a/c or something. Me? I always set it to automatic and never have any problems (and never smell any fumes if I'm behind a diesel truck or bus.)
06-27-2008, 05:56 PM
#12
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My Ride: 2004 545i titanium grey 6 speed manual with light grey interior. Nav, L7, cold weather, sport, sat. Modifications: suede headliner, pianno black interior trim, Ipod dock, Mtech front bumper, Angel Eyes, and flat black kidney grills.
Originally Posted by Rudy' post='611060' date='Jun 26 2008, 10:20 PM
If ever there was a reason to use the 
smiley, this would be it... 
Here's a little hint, depending on the year of your car, see if you can find a button that looks like one of the following:
2008 model:
Attachment 53478
pre-2008 model:
Attachment 53479
Once you find the button, you'll know what to look for when you so you can learn to set it properly... 
smiley, this would be it... Here's a little hint, depending on the year of your car, see if you can find a button that looks like one of the following:
2008 model:
Attachment 53478
pre-2008 model:
Attachment 53479
Once you find the button, you'll know what to look for when you
so you can learn to set it properly...
06-28-2008, 07:13 AM
#13
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Originally Posted by Rudy' post='611566' date='Jun 27 2008, 06:15 PM
Sort of, but not really. The car always passes outside air through a carbon filter -- when the button is pressed to recirculate, it cuts off the outside air and recirculates only inside (already filtered) air. When the button is pressed to allow outside air, it allows fresh (filtered) air to enter the cabin.
In automatic ("A") mode, the car detects when there are pollutants present (which can cause an odor) and automatically switches things from outside air to recirculate (and back again when the pollutants are no longer detected.) This is the best setting to use since keeping it set to recirculate can cause a lack of oxygen (adding to driver fatigue) as well as an increased tendency for the windows to fog.
The only other real benefit to recirculate mode is that sometimes the car will cool down faster if you're runinng max a/c or something. Me? I always set it to automatic and never have any problems (and never smell any fumes if I'm behind a diesel truck or bus.)
In automatic ("A") mode, the car detects when there are pollutants present (which can cause an odor) and automatically switches things from outside air to recirculate (and back again when the pollutants are no longer detected.) This is the best setting to use since keeping it set to recirculate can cause a lack of oxygen (adding to driver fatigue) as well as an increased tendency for the windows to fog.
The only other real benefit to recirculate mode is that sometimes the car will cool down faster if you're runinng max a/c or something. Me? I always set it to automatic and never have any problems (and never smell any fumes if I'm behind a diesel truck or bus.)
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