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      11-29-2011, 09:34 AM   #1
shah269
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No I'm sorry I don't want the AC on.

No I'm sorry I don't want the AC on.

OK it's 55f outside....I want the inside temp of my car at 70.....but every time I put the HVAC on Auto it kicks on the AC.
So what is it doing cooling down the air and then heating it up?
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      11-29-2011, 09:53 AM   #2
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There's a reason it's called air conditioning and not refrigeration. It takes humidity out of the air, generally making things more comfortable. If you set the temp to 70, it will get to 70, with or without the a/c on, but it will be dryer air if you leave the a/c on.
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      11-29-2011, 10:13 AM   #3
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I'm pretty sure the compressor only engages if the outside air temperature is above a specific threshold, otherwise you'd risk freezing and damaging the AC lines.
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      11-29-2011, 10:18 AM   #4
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I'm in agreement. I don't like the fact that the AC runs in the winter when it's not really needed. Understand the whole "air conditioning" concept. But IMO it's a waste of power and fuel.
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      11-29-2011, 11:00 AM   #5
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1. Selecting AUTO engages the compressor at temps above freezing.
2. Simply pushing the A/C button will turn off the compressor.
3. When the car is shut down in AUTO mode with A/C shut off, it will restart the same way and you won't have to push the button.

It is what it is.

My 128i and 328i both use approximately 5~10% more fuel when running A/C so I turn it off unless cooling or defogging is required.

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      11-29-2011, 12:09 PM   #6
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Quote:
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2. Simply pushing the A/C button will turn off the compressor.
It also takes you out of "Auto" mode. Kind of kills the whole point.
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      11-29-2011, 12:17 PM   #7
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Quote:
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Quote:
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2. Simply pushing the A/C button will turn off the compressor.
It also takes you out of "Auto" mode. Kind of kills the whole point.
When I push the A/C button in my 2012 135 it does not kill the "Auto" mode.
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      11-29-2011, 12:21 PM   #8
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When I push the A/C button in my 2012 135 it does not kill the "Auto" mode.
Are you sure?
Basically it just continues on the current settings. Will not increase/decrease fan speed based on temp.
And at least on mine, the "auto" light goes out.
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      11-29-2011, 12:27 PM   #9
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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.
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      11-29-2011, 01:49 PM   #10
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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 2008.
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      11-29-2011, 04:19 PM   #11
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I'm in agreement. I don't like the fact that the AC runs in the winter when it's not really needed. Understand the whole "air conditioning" concept. But IMO it's a waste of power and fuel.
The whole point of electronic climate control is 'set and forget'..... switching half of it off seems rather pointless to me............

A bit like buying a dog and then barking yourself .......

Only time I'd ever bother to switch off the compressor would be when taking it on a track.
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      11-29-2011, 04:50 PM   #12
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Also...WTH is that rest button do? Looks like it's rest for some sort of heating system that only the Germans know about?
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      11-29-2011, 05:02 PM   #13
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Also...WTH is that rest button do? Looks like it's rest for some sort of heating system that only the Germans know about?
On cold days, you can press rest to keep the cabin warm. IE filling @ gas station, popping into a store for moment, etc.
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      11-29-2011, 05:32 PM   #14
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On cold days, you can press rest to keep the cabin warm. IE filling @ gas station, popping into a store for moment, etc.
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.......
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      11-29-2011, 08:28 PM   #15
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Good grief...it's one button to push - deal with it, already! And...my 2011 128i M-Sport doesn't turn off the AUTO mode when I turn off the A/C.

I remember when "climate control" consisted of a heater for cold weather and manual roll-down windows in warm weather. These dang kids these days!
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      11-29-2011, 11:12 PM   #16
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Some people would just be happier in an aveo
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      11-29-2011, 11:59 PM   #17
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Just set it and forget it!

These cars are designed very well and the power loss is minimal if any. Also, it is good to have the ac run occasionally in the winter to keep the system lubricated. If you don't use the ac all winter you will see more issues down the road because the system is not suppose to go that long without lubrication/use.
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      11-30-2011, 09:00 AM   #18
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always on Automatic AC mode. I can't imagine getting a car without this option.
one more advantage to having it is that windows are always dry giving the ultimate visibility in cold humid time.
mine is set to 22 degrees Celsius, all year around
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      11-30-2011, 10:20 AM   #19
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Quote:
Originally Posted by TMR013 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.
Are you sure?
Basically it just continues on the current settings. Will not increase/decrease fan speed based on temp.
And at least on mine, the "auto" light goes out.
Yep, auto stays on and does what it is supposed to do. I can turn the car off and back on without the A/C going back on. Auto is still on though all of this and works properly without the A/C button active.
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      11-30-2011, 11:59 AM   #20
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Quote:
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The whole point of electronic climate control is 'set and forget'..... switching half of it off seems rather pointless to me............ .
This is what folks said a decade ago when the E46 "AUTO" setting did not turn on the A/C. Personally, I found that system preferable as every BMW I've driven has had a noticeable fuel consumption penalty with the compressor engaged.

But if you want A/C on all the time, so be it.

Tom
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      11-30-2011, 12:50 PM   #21
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My Audi has an "econ" button that allows the auto system to work as well as possible without running the compressor. I much prefer having the ability to leave the compressor off and hoping the 2010 I'm picking up tomorrow has that ability. Sounds like just hitting the a/c should do the trick.
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      11-30-2011, 01:17 PM   #22
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Gentlemen, Gentlemen!

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