F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > BIMMERPOST Universal Forums > General Automotive (non-BMW) Talk + Photos/Videos > A/C on or off during winter?
GetBMWParts
Post Reply
 
Thread Tools Search this Thread
      01-30-2019, 10:43 PM   #23
xQx
General
Australia
877
Rep
1,009
Posts

Drives: 2008 BMW 135i (E88 N54 6AT)
Join Date: Aug 2016
Location: Sunshine Coast QLD Australia

iTrader: (0)

Quote:
Originally Posted by boonkgang13k View Post
I'm confused if I should turn on A/C during winter. I changed the setting, so that only warm air is coming out. What are the benefits or disadvantages using A/C during winter?
If you need to either cool the air in your car or dry the air in your car you'll want the air conditioner on.

If you want to heat the air in your car, you'll want the heater on.

It is entirely possible to have both the heater and air conditioner on at the same time, giving you warm, dry air in the car.

It's often preferable to run the aircon & heater in winter so your breath doesn't fog up the windows, and so your wet boots can be dried while you're in the car - also drying your carpets and preventing them from going moldy.

If you leave the BMW heater system on full auto and just dial up the temperature you want; you'll find it does all of this for you automatically.

The air conditioner is powered by a pump attached to the engine, so it uses a little bit more fuel and takes a little bit of engine power away from the back wheels compared with when it's turned off. This was/is noticeable in cars with about 40kw of engine power, but you'll never notice the effect of it running all the time in your car. This also means you will have no air conditioning unless the engine is running (idling at least). Air is blown via an electric fan, which uses stuff-all power to operate; and will work even if your engine is turned off.

Quote:
Originally Posted by boonkgang13k View Post
Also, when the engine is off, the air is not as warm as the engine is on, what should I do?
It is extremely rare for cars to run an electric heating element in their heater. Most cars (It's been very difficult to try to find a schematic of the e82 heating system online) and I'm assuming ours, simply run a second radiator under the dash that's filled with the engine coolant (water). Thus, your heater will only work when your engine coolant is hotter than the cabin. (ie. when the engine is running).

Use your heated seats when you first get in the car. They're heated by an electric element, and thus will provide instant warmth.
Appreciate 0
      02-03-2019, 04:45 PM   #24
Efthreeoh
Lieutenant General
United_States
9845
Rep
16,363
Posts

Drives: E90 & Z4 Coupe
Join Date: May 2012
Location: MARLAND

iTrader: (0)

With the Auto climate control system, the A/C does not run at all times when the green light is illuminated. The green light just means the AC compressor is available when needed to condition the air (i.e. for the defrost function).
__________________
A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
Appreciate 0
      02-03-2019, 05:08 PM   #25
JamesNoBrakes
Colonel
JamesNoBrakes's Avatar
1586
Rep
2,442
Posts

Drives: Camaro SS 1LE
Join Date: May 2015
Location: Alaska

iTrader: (0)

I had the hardest time with this in my BMW because apart from the temperature select, there's also that temperature select on the vent itself, so when I was trying to get heat and it was cold outside, it would just send ice-cold air at me. Why the hell there's a secondary temperature select on the vent makes no sense to me, but it is what it is. The car wants to run the A/C all the time, most newer cars do, to keep from fogging. When i turn on a car in the winter though, I want heat as soon as possible....
__________________
Current: 2018 Camaro SS 1LE, 2022 Kia Stinger. Former: BMW 428i Gran Coupe.
Appreciate 1
Kyngofpop676.50
      02-04-2019, 09:35 AM   #26
baege
Major
795
Rep
1,324
Posts

Drives: 2020 BMW M2 COMP
Join Date: Jun 2009
Location: Toronto, Canada

iTrader: (0)

Quote:
Originally Posted by Kooch View Post
I leave it off year round unless I have fogging issues. I can notice the difference between on and off in performance and prefer it off. Personal preference.
I am with ya brotha...just another layer of disconnection I dont need
Appreciate 0
      02-04-2019, 02:56 PM   #27
Slops
Major General
Slops's Avatar
South Africa
162
Rep
5,417
Posts

Drives: 2005 C55 AMG
Join Date: Jan 2011
Location: Oxford

iTrader: (2)

Mine is always on to prevent fogging up cold windows. That is all
Appreciate 0
      02-04-2019, 04:01 PM   #28
Z K
Major General
Z K's Avatar
United_States
1500
Rep
5,037
Posts

Drives: E90 M3, F30 328i
Join Date: Jul 2011
Location: San Francisco

iTrader: (3)

I turn it on if I need to defog my interior windows. Otherwise it is always off.

Driving manual transmission with the AC on takes getting used to. The AC draws power from the car and it changes your clutch engagement points. RPMs drop faster between gears with the AC on and there is noticeable throttle lag.
__________________
Auto Detailing Enthusiast!
Appreciate 0
      02-04-2019, 04:22 PM   #29
Efthreeoh
Lieutenant General
United_States
9845
Rep
16,363
Posts

Drives: E90 & Z4 Coupe
Join Date: May 2012
Location: MARLAND

iTrader: (0)

Quote:
Originally Posted by JamesNoBrakes View Post
I had the hardest time with this in my BMW because apart from the temperature select, there's also that temperature select on the vent itself, so when I was trying to get heat and it was cold outside, it would just send ice-cold air at me. Why the hell there's a secondary temperature select on the vent makes no sense to me, but it is what it is. The car wants to run the A/C all the time, most newer cars do, to keep from fogging. When i turn on a car in the winter though, I want heat as soon as possible....
The temp wheel on the center vents is there to mimic older 1980s BMWs with manual HVAC systems. The E21, E24, E28, E30, to name a few, had a HVAC system that allowed cool air to flow from the dash vents, while warm air could flow from the footwell and defroster vents. The temperature dial had to be at or less than 3/4 from highest setting. The purpose was to allow cool air to flow on the driver and front passenger's face and torso in the situation where it was a cold but sunny day, to counteract the solar-warming effect from the sun on the cabin/greenhouse.
Appreciate 0
      02-04-2019, 05:51 PM   #30
overlook637
Lieutenant
232
Rep
464
Posts

Drives: M4
Join Date: Mar 2018
Location: USA

iTrader: (0)

Quote:
Originally Posted by Radu328i View Post
Time to time you have to turn it on for 5 -10 min. to oil de gaskets and avoid the further leaks.
I read that BMW already does this. Not just for the gaskets but to keep the air ducts from getting musky smelling.
Appreciate 0
      02-12-2019, 09:18 PM   #31
Jmrdmd
New Member
8
Rep
24
Posts

Drives: 2019 X7 50i
Join Date: Mar 2018
Location: NJ

iTrader: (0)

AC on all year long=no foggy windows
__________________
2019 X7
2018 Porsche GT3
2018 AMG GT Roadster
2018 F150 Limited
Appreciate 0
      08-04-2021, 05:17 AM   #32
Marilami
Registered
0
Rep
1
Posts

Drives: AMG 2
Join Date: Jul 2021
Location: Chicago

iTrader: (0)

Choosing a good air conditioner for your car is a really complicated process because some of them are not compatible with some cars. For example, I bought an aircon from Mitsubishi and it didn't work with my BMW properly, so I needed to get it back to the shop. Therefore, before choosing a suitable air conditioner it is better to consult with professionals and buy aircons exactly the same brand as in your car. When I bought my new one, I consulted with airconservicing.org and I definitely recommend their service.

Last edited by Marilami; 08-08-2021 at 07:55 AM..
Appreciate 0
      08-04-2021, 12:59 PM   #33
Fritzer
No one sleep in Tokyo
Fritzer's Avatar
No_Country
833
Rep
1,490
Posts

Drives: 2011 E90 328i//1995 E34 530i
Join Date: Oct 2018
Location: San Diego, California -> Austin, Texas

iTrader: (3)

Cool and dry is the way to go. The drying factor is my favorite part, even in winter. When I lived in San Diego I would normally leave the air set at it's coolest with AC turned off. Anywhere where it's humid or snows, you will want to have AC most of the time.
__________________
2011 E90 328i, 1995 E34 530i, 1992 E32 740i, 1991 E34 525i
Appreciate 1
      08-04-2021, 01:37 PM   #34
6oclockshadow
Private First Class
6oclockshadow's Avatar
United_States
293
Rep
152
Posts

Drives: 2021 M340i
Join Date: Feb 2021
Location: Boston; Clifden, IE

iTrader: (0)

Mine is set to A/C; Auto. Along with the lights, and windscreen wipers. That way my car knows when its raining/snowing and needs defogging/dehumidifying.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:24 PM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST