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      11-30-2011, 01:19 PM   #23
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OK, I was wrong, it does stay in auto mode when you turn off the AC button. Although I could swear it didn't use to do that.
In any case, it probably depends on where you live. Here in AZ, humidity is rarely a problem, especially in the winter. So it's still a waste to run the compressor when it's cool.
Thanks for straightening me out everybody, I will use this more often now.
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      11-30-2011, 01:42 PM   #24
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Most cars run the A/C when you set it to defrost the front window. May or not make you aware of it in the process, but do it. If our Auto mode hits the front window it's not surprising it turns the A/C on as well.
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      11-30-2011, 02:23 PM   #25
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My 2006 Suzuki SUV works the same as my 2009 128i vert. Auto turns on the AC, pushing the AC button turns it back off. Most of the time, it is set in Auto with AC off. I don't like having to set the temp slider to get the temperature I want but I want to decide if I need the AC or not. I don't fully understand what the bimmer is doing yet but the zuk likes to switch on the AC on cool days just because the temp inside the car is high. Running the vent solves it in a couple minutes. Silly to run the AC. The zuk also wants to run in recirc mode - even under these circumstances.

I like conveniences but I also want the car to do what I want it to do. And yes, my bimmer (and zuk) are manual transmissions.

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      11-30-2011, 04:16 PM   #26
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Quote:
Originally Posted by bmw View Post
Gentlemen, Gentlemen!

Leave it on. The interior air quality is much better, and it serves one major purpose; KEEPING THE WINDOWS DEFOGGED.
you're right. the main and most important purpose is keeping the windows DEGOGGED.
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      11-30-2011, 05:34 PM   #27
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Quote:
Originally Posted by bmw View Post
KEEPING THE WINDOWS DEFOGGED.
This.
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      11-30-2011, 06:05 PM   #28
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Quote:
Originally Posted by bmw View Post
Gentlemen, Gentlemen!

Leave it on. The interior air quality is much better, and it serves one major purpose; KEEPING THE WINDOWS DEFOGGED.
1. Since turning off the compressor doesn't defeat the cabin filter, why is the interior air better? (I've never noticed a difference.)

2. The eastern US tends to have much lower humidity in the winter so defogging is normally not required. And if it is, is it that hard to push the damn snowflake button?

I'm reminded of my 1973 Plymouth Fury which featured an A/C compressor which was designed to always be engaged whenever the motor was running. As A/C dropped the 400ci engine's fuel mileage from about 11 to 8 mpg, I wired a switch to turn it off. At least our modern cars have that switch.

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      11-30-2011, 06:33 PM   #29
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Quote:
Originally Posted by Tom K. View Post

I'm reminded of my 1973 Plymouth Fury which featured an A/C compressor which was designed to always be engaged whenever the motor was running. As A/C dropped the 400ci engine's fuel mileage from about 11 to 8 mpg, I wired a switch to turn it off. At least our modern cars have that switch.

Tom
Yep, reminds me of and having all GM cars (the compressor kicked on with the Defogger/defroster), Then going to Acura cars for a while in the 90s: you could run the defrost/defogger all day long on them to no avail....until you hit the AC button, thus the compressor.
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      11-30-2011, 08:12 PM   #30
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I'm still hung up on the "rest" feature. Do we get this on US models? OR am I to dumb to figure this out?
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      11-30-2011, 09:45 PM   #31
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I'm still hung up on the "rest" feature. Do we get this on US models? OR am I to dumb to figure this out?
Yes. It blows warm air off the engine into the cabin for 10 min? After the engine has been turned off.
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      11-30-2011, 10:44 PM   #32
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Quote:
Originally Posted by New21er View Post
I'm still hung up on the "rest" feature. Do we get this on US models? OR am I to dumb to figure this out?
Wasn't the REST (Residual Heat) function of the '08 & '09 1ers replaced with the ALL function beginning with the 2010 models?

So I don't believe it's on your car.

Tom
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      11-30-2011, 10:58 PM   #33
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Quote:
Originally Posted by Tom K. View Post
Wasn't the REST (Residual Heat) function of the '08 & '09 1ers replaced with the ALL function beginning with the 2010 models?

So I don't believe it's on your car.

Tom
I think so. I know for sure this was a change on the 2010 335

Last edited by BimmerEnthusiast99; 12-01-2011 at 01:14 AM.
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      11-30-2011, 11:17 PM   #34
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I think your right. I don't hear anything when i shut down my car.
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      12-02-2011, 01:12 PM   #35
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The Rest function was sppressed in 2010 or 2011. My 2011 does not have it
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      12-02-2011, 02:07 PM   #36
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My 09 has Rest and I used it from time to time after hard runs after I shut down.
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      12-02-2011, 02:10 PM   #37
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Quote:
Originally Posted by Tom K. View Post
2. The eastern US tends to have much lower humidity in the winter so defogging is normally not required. And if it is, is it that hard to push the damn snowflake button?
Kinda the opposite, for a different reason.

This is about the air inside of the car, not out. The air starts drier but as you and / or other passengers breathe inside the car the humidity goes up. Not much but noticeable. The real problem is the outside temperature making the windows very cold. Now that humidity condenses on them.

Ever see a foggy window in the summer? No. Ever see it in winter? Yes, all the time - well in MN I do.
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      12-02-2011, 02:14 PM   #38
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My AC on my E30 was a dog. If the windows ever fogged up I would have to pull over for 5 minutes in order for them to defog.
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      12-02-2011, 03:09 PM   #39
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Quote:
Originally Posted by bmw View Post
Gentlemen, Gentlemen!

Leave it on. The interior air quality is much better, and it serves one major purpose; KEEPING THE WINDOWS DEFOGGED.
+1

Also, having the ac cycle every once and a while helps deal with the collection of stagnet condensate that collects in the evaporator box... the ac on cause fresh condensate to wash things down, sort to speak.

also cycling the ac helps keep all the seals and the ac clutch cycled.

ever try to start a car that hasent been started in a while... first thing to seize is the ac clutch.. hence all the red dust near the ac
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      12-03-2011, 11:08 AM   #40
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Quote:
Originally Posted by tracer bullet View Post
Kinda the opposite, for a different reason.

This is about the air inside of the car, not out. The air starts drier but as you and / or other passengers breathe inside the car the humidity goes up. Not much but noticeable. The real problem is the outside temperature making the windows very cold. Now that humidity condenses on them.

Ever see a foggy window in the summer? No. Ever see it in winter? Yes, all the time - well in MN I do.
Here in sunny(?) but humid MD, it only seems to be an issue during the summer and occaisionally during a rainy fall. But if you need it during the winter in MN, by all means use your A/C.

Tom
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      12-05-2011, 12:03 PM   #41
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Quote:
Originally Posted by Glove View Post
Quote:
Originally Posted by fondeezy View Post
When I push the A/C button in my 2012 135 it does not kill the "Auto" mode.
Same on my 2012.

Same on my 2012
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      12-12-2011, 09:45 AM   #42
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Quote:
Originally Posted by amancuso View Post
On cold days, you can press rest to keep the cabin warm. IE filling @ gas station, popping into a store for moment, etc.
Quote:
Originally Posted by shah269 View Post
What! Oh I have to try this!
So if the car is off it will keep the car warm!
But I don't have hands free.......
I have to try this too!
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      12-12-2011, 12:44 PM   #43
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Power Loss

I notice a slight power loss ~5-10% when the A/C compressor is engaged. I am almost positive that it is not in my head. Anyone else feel that way?

My Ford Ranger could barely get out of its own way when the compressor is engaged. Well it could barely ever get out of its own way - it was just even more pronounced when the ac was on.
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      12-12-2011, 01:00 PM   #44
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Quote:
Originally Posted by jgoldsmith729 View Post
I notice a slight power loss ~5-10% when the A/C compressor is engaged. I am almost positive that it is not in my head. Anyone else feel that way?

My Ford Ranger could barely get out of its own way when the compressor is engaged. Well it could barely ever get out of its own way - it was just even more pronounced when the ac was on.
Usually a/c power loss is in the 3-5 hp range. If you can feel 1%, you need to look for employment from CAI companies. It also disengages at WOT.
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