Using Auto Climate control

Brasco · 08-27-2008, 02:01 PM

So the temps are slowly dropping everyday and I decided to see if my heat works in the car. Auto climate control is turned off. So i turn both temps to 28C and hit the Auto button. How come the a/c light appears when I want heat instead? Does the a/c shut off after? Hot air does come but with the a/c light still on.

shiccobm · 08-27-2008, 02:29 PM

good question , this is my first BMW and i would really like to know as well how to use this great function and have u tried useing the REST function and how do u really apply it thanks

neteagle · 08-27-2008, 03:11 PM

Quote:

Originally Posted by Brasco

So the temps are slowly dropping everyday and I decided to see if my heat works in the car. Auto climate control is turned off. So i turn both temps to 28C and hit the Auto button. How come the a/c light appears when I want heat instead? Does the a/c shut off after? Hot air does come but with the a/c light still on.

My guess is to control humidity...

warmtoes · 08-27-2008, 03:18 PM

All cars I have had that have auto climate control do turn on the A/C. All you do is turn off the A/C by pushing the A/C button and the Auto still works when you want heat.

I believe it is to control humidity. It also helps to defog windows a lot faster too.

PeeJay · 08-27-2008, 03:19 PM

Yes, neteagle is right....AC is conditioned air which is in sense, dehumidified air. You can have hot or cold AC. AC is normally used to blow cold air because in the summer, humidity is higher compared with winter.

So, by setting it in auto mode, the AC light may come on even though you set the temp high, such as 28C.

pit1 · 08-27-2008, 03:24 PM

That is normal operation for BMWs. My past models have acted the same way. I just manually override, but it is very useful when dealing with fogged windows in the winter. I believe there is a brief discussion in the manual about this.

1Ronnie · 08-28-2008, 11:57 AM

I have been told by an AC unit reconditioner, that AC lasts longer if it's used constantly as well, the coolant can settle and loose effectiveness if not used (?), but that's just what I heard.

warmtoes · 08-28-2008, 12:38 PM

I have also heard the same thing. I just like having better gas mileage when I don't really need the A/C.

neteagle · 08-28-2008, 01:17 PM

Quote:

Originally Posted by arrons1969

I have been told by an AC unit reconditioner, that AC lasts longer if it's used constantly as well, the coolant can settle and loose effectiveness if not used (?), but that's just what I heard.

The reason for that is that the refridgerant actually lubricates and conditions seals...if you don't use your AC, the seals will dry up and degrade and refridgerant will leak out...I never used the AC in my GTI and when I finally started using it again, it was toast

1Ronnie · 08-28-2008, 09:44 PM

Quote:

Originally Posted by warmtoes

I have also heard the same thing. I just like having better gas mileage when I don't really need the A/C.

Well that's how you end up with the Warm Toes ... Ha Ha

08-27-2008, 02:01 PM	#1
Brasco Enlisted Member 0 Rep 30 Posts Drives: Join Date: May 2008 iTrader: (0)	Using Auto Climate control So the temps are slowly dropping everyday and I decided to see if my heat works in the car. Auto climate control is turned off. So i turn both temps to 28C and hit the Auto button. How come the a/c light appears when I want heat instead? Does the a/c shut off after? Hot air does come but with the a/c light still on.
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08-27-2008, 02:29 PM	#2
shiccobm Neo 10 Rep 161 Posts Drives: 2007 335I Join Date: Jul 2008 Location: GTA iTrader: (0)	good question , this is my first BMW and i would really like to know as well how to use this great function and have u tried useing the REST function and how do u really apply it thanks __________________ Road 1'er
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08-27-2008, 03:18 PM	#4
warmtoes Lieutenant Colonel 31 Rep 1,917 Posts Drives: EBII 435i xDrive Join Date: Apr 2008 Location: Vancouver iTrader: (1)	All cars I have had that have auto climate control do turn on the A/C. All you do is turn off the A/C by pushing the A/C button and the Auto still works when you want heat. I believe it is to control humidity. It also helps to defog windows a lot faster too. __________________ *2014 EBII 435i xDrive M-sport* Gone: 2011 TiAg F25 X3 xDrive35i M-sport Gone: 2008 TiAg w/Coral Red E88 135i Cab M-sport
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08-27-2008, 03:19 PM	#5
PeeJay Private 3 Rep 56 Posts Drives: 2014 LSB 335i xDrive M Perf. Join Date: Mar 2008 Location: Greater Toronto Area iTrader: (0)	Yes, neteagle is right....AC is conditioned air which is in sense, dehumidified air. You can have hot or cold AC. AC is normally used to blow cold air because in the summer, humidity is higher compared with winter. So, by setting it in auto mode, the AC light may come on even though you set the temp high, such as 28C.
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08-27-2008, 03:24 PM	#6
pit1 Captain 239 Rep 790 Posts Drives: F87 M2 Join Date: May 2008 Location: It's always Sunny... iTrader: (1)	That is normal operation for BMWs. My past models have acted the same way. I just manually override, but it is very useful when dealing with fogged windows in the winter. I believe there is a brief discussion in the manual about this.
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08-28-2008, 11:57 AM	#7
1Ronnie Ronnie 15 Rep 556 Posts Drives: '08 Sedona 128i Join Date: May 2008 Location: Vancouver, BC iTrader: (0)	I have been told by an AC unit reconditioner, that AC lasts longer if it's used constantly as well, the coolant can settle and loose effectiveness if not used (?), but that's just what I heard. __________________ "Lucy" 128i / Sedona Red / Coral Red / Premium Package / Premium Sound
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08-28-2008, 12:38 PM	#8
warmtoes Lieutenant Colonel 31 Rep 1,917 Posts Drives: EBII 435i xDrive Join Date: Apr 2008 Location: Vancouver iTrader: (1)	I have also heard the same thing. I just like having better gas mileage when I don't really need the A/C. __________________ *2014 EBII 435i xDrive M-sport* Gone: 2011 TiAg F25 X3 xDrive35i M-sport Gone: 2008 TiAg w/Coral Red E88 135i Cab M-sport
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