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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 08-07-2005, 02:01 AM
startover startover is offline
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So is it better to turn off the AC before shutting down the engine?

Or is it a myth? Many people (expecially older ones ) seem to believe that doing so will improve the longevity of the AC system and the overall health of the car. I wonder what the logic is behind this and if it applies to our bimmers.
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  #2  
Old 08-07-2005, 03:15 AM
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machmeter machmeter is offline
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Interesting question...
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  #3  
Old 08-07-2005, 03:30 AM
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FenPhen FenPhen is offline
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Quote:
Originally Posted by startover
Many people (expecially older ones ) seem to believe that doing so will improve the longevity of the AC system and the overall health of the car.
It's not the longevity of the AC so much as discouraging mildew growth which leads to that musty odor you get when you turn off the AC. The idea is to shut off the AC and let the fan dry out moisture that has collected from condensation. Personally, it's not a problem (yet ) with my car, and I usually don't turn off the AC a few minutes before parking, but sometimes I do. I kinda suspect you are more vulnerable if you left the AC on in humid conditions (either during the day or coming home at night), but not sure why some people have bad luck and others don't. Also, it's a problem that's common across different car makes.
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  #4  
Old 08-07-2005, 09:00 AM
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Fast Bob Fast Bob is offline
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Quote:
Originally Posted by FenPhen
It's not the longevity of the AC so much as discouraging mildew growth which leads to that musty odor you get when you turn off the AC. The idea is to shut off the AC and let the fan dry out moisture that has collected from condensation. Personally, it's not a problem (yet ) with my car, and I usually don't turn off the AC a few minutes before parking, but sometimes I do. I kinda suspect you are more vulnerable if you left the AC on in humid conditions (either during the day or coming home at night), but not sure why some people have bad luck and others don't. Also, it's a problem that's common across different car makes.
This is logical, but not practical, as you would have to sit with the fan running until the temperature of all the ductwork in the AC`s system reached ambient temp in order to prevent any condensation.... I don`t have that much time to spare.... :-)

Regards,
Bob
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Old 08-08-2005, 07:36 PM
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I always turn it off a couple of block or so before home or work... dry off the coil and prevent mildew or other smells.
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Old 08-14-2005, 04:39 PM
dslick2025 dslick2025 is offline
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So now after reading this thread, I am curious about that smell that comes out without the A/C on. What is this smell and how can I remove it? It smells like...a rotten damp cloth or something. It's not too bad, but it can get annoying sometimes especially when I have people in my car.
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