AC during start-stop? - BMW 3-Series Forum (F30 / F32)

Noor · 07-08-2012, 04:23 PM

Guys in "Start Stop" when the car shuts down what happens to the AC?

bcl0328 · 07-08-2012, 04:33 PM

it stays on

Noor · 07-08-2012, 04:38 PM

On, Cold or warmer?

bcl0328 · 07-08-2012, 04:45 PM

what

Noor · 07-08-2012, 04:56 PM

Does it become warmer or stays at the same cool level?

onehungevo · 07-08-2012, 05:18 PM

The speed of the A/C seems to drop.

cavm335i · 07-08-2012, 05:31 PM

mine stays the same, the car does not turn off at lights when it's hot outside (seems to be hotter than low 90s).

live4wknds · 07-08-2012, 05:56 PM

The fan slows to a lower setting, still blowing cool air. If the thermostat is set an a low temp and the cabin hasn't been cooled to that setting, the motor will restart after a brief period and the fan will resume to it's prior speed. If MAX cooling is on, ASS will not engage at a stop.
I believe this is all documented in the manual.

omarliendo · 07-08-2012, 08:43 PM

In the F30's, the AC units have been detached from the engine so the AC should stay at the same temperature that was set when the car was functioning.

JoeyO · 07-09-2012, 07:52 AM

He he, he said ASS.

cavm335i · 07-09-2012, 08:05 AM

Quote:

Originally Posted by live4wknds

If the thermostat is set an a low temp and the cabin hasn't been cooled to that setting, the motor will restart after a brief period and the fan will resume to it's prior speed. If MAX cooling is on, ASS will not engage at a stop.

I was wondering why my car would start back up randomly at lights, that is probably it.

iM · 07-09-2012, 09:15 AM

Quote:

Originally Posted by ronnyb29

mine stays the same, the car does not turn off at lights when it's hot outside (seems to be hotter than low 90s).

^^ this. Auto Start/Stop will be disabled when it's too hot outside so the driver doesn't have to seat in hot spa.

wmo168 · 07-13-2012, 04:05 PM

The car engine will restart if the AC is not cold enough.

dd1981 · 07-13-2012, 07:33 PM

Quote:

Originally Posted by ronnyb29

mine stays the same, the car does not turn off at lights when it's hot outside (seems to be hotter than low 90s).

Quote:

Originally Posted by ronnyb29

I was wondering why my car would start back up randomly at lights, that is probably it.

Its not called A.S.S. its actually refered to as M.A.S. I was corrected by my dealer, when I had the car there. And I also learned it wont function when its above 98* out, And I believe he said it wont function below 20* outside. He said the computer is constantly scannig the paramaters, and he said even the battery has to be a certain voltage for it to work. If the voltage drps it turns the car back on. THis is probably what people are experiencing.

Elk · 07-13-2012, 07:42 PM

Quote:

Originally Posted by dd1981

Its not called A.S.S. its actually refered to as M.A.S. . . .

Sure looks like ASS to me:

"Auto Start/Stop function

The concept

The automatic engine start-stop function helps
save fuel. The system switches off the engine
during a stop, . . . ."

P. 61 of the manual

dd1981 · 07-13-2012, 08:27 PM

Quote:

Originally Posted by Elk

Sure looks like ASS to me:

"Auto Start/Stop function

The concept

The automatic engine start-stop function helps
save fuel. The system switches off the engine
during a stop, . . . ."

P. 61 of the manual

Thats what I told them when mine wasnt functioning, but he said in their system it comes up as M.A.S he thinks they did it like that because of exactly how its spelled ASS lol. I wouldnt think Germans care to change it since ass means nothing.

I dunno

this is what my Service guy said.

They reflashed my car and it now works flawless.

TLennox · 07-13-2012, 08:48 PM

Let me get this right - The ASS system will turn off when it's too hot or too cold?

DmitryF30 · 07-13-2012, 09:03 PM

Here is the excerpt from BMW TIS technician training files:
-To maintain the climate control of the passenger compartment when the engine is off, for vehicles with automatic start/stop function, a cold accumulator, known as the storage evaporator is installed.

ZMM_OMG · 07-13-2012, 10:20 PM

So there's a sensor that monitors my interior and shuts down my ASS if it's outside operational tolerances? Talk about a "back up" system.

(Sorry... couldn't resist)

Elk · 07-14-2012, 08:54 AM

Quote:

Originally Posted by DmitryF30

Here is the excerpt from BMW TIS technician training files

Neat!

Thank you

cavm335i · 07-15-2012, 10:18 PM

Yes, on warmer days it won't turn off or it will turn off but then turn back on after about a minute.

jonrick1 · 07-18-2012, 03:25 PM

I just downloaded the owners manual. (pp61-63). There is a button on top of the on/off switch that you can use to shut off the stop/start feture. The manual also says that when the car is stopped, the AC fan function will be reduced.

07-08-2012, 04:23 PM	#1
Noor Private First Class Drives: '12 BMW 328i, '02 VW Passat V6 Join Date: Jun 2012 Location: Saudi Arabia Posts: 137 iTrader: (0)	AC during start-stop? Guys in "Start Stop" when the car shuts down what happens to the AC?
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07-13-2012, 04:05 PM	#13
wmo168 Lieutenant Drives: '12 335i F30 AW Join Date: Feb 2009 Location: South Florida Posts: 455 iTrader: (0)	The car engine will restart if the AC is not cold enough. __________________ ED 04/17/12, PCD ??/??/12 - 12' 335i F30 AW ED 05/01/11, PCD 07/01/11 - 11' M3 E93 MW (Gone) ED 08/13/09, PCD 10/14/09 - 09' 135i E82 AW (Gone) [ED Photo 12'] [ED Photo 11'] [ED Photo 09'] [PCD Photo 09']

07-13-2012, 08:48 PM	#17
TLennox Enlisted Member Drives: 335i Join Date: Jun 2012 Location: Delaware Posts: 45 iTrader: (0)	Let me get this right - The ASS system will turn off when it's too hot or too cold? Last edited by TLennox; 07-13-2012 at 09:40 PM.

07-13-2012, 09:03 PM	#18
DmitryF30 New Member Drives: Bimmer Join Date: Jun 2012 Location: Houston, TX Posts: 24 iTrader: (0) Garage List 2012 328i [4.50] 2006 M5 [5.00]	AC Keeps Chilling Here is the excerpt from BMW TIS technician training files: -To maintain the climate control of the passenger compartment when the engine is off, for vehicles with automatic start/stop function, a cold accumulator, known as the storage evaporator is installed. Attached Images __________________ E36/37 Z3 AUTO - retired E46 325i MT - retired E60 545i MT - retired E60 M5 SMG - fast F30 328i MT - daily driver

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07-08-2012, 04:33 PM	#2
bcl0328 Captain Drives: 2012 328i Join Date: Mar 2012 Location: Abingdon, MD Posts: 955 iTrader: (0)	it stays on

07-08-2012, 04:38 PM	#3
Noor Private First Class Drives: '12 BMW 328i, '02 VW Passat V6 Join Date: Jun 2012 Location: Saudi Arabia Posts: 137 iTrader: (0)	On, Cold or warmer?

07-08-2012, 04:45 PM	#4
bcl0328 Captain Drives: 2012 328i Join Date: Mar 2012 Location: Abingdon, MD Posts: 955 iTrader: (0)	what

07-08-2012, 04:56 PM	#5
Noor Private First Class Drives: '12 BMW 328i, '02 VW Passat V6 Join Date: Jun 2012 Location: Saudi Arabia Posts: 137 iTrader: (0)	Does it become warmer or stays at the same cool level?

07-08-2012, 05:18 PM	#6
onehungevo Captain Drives: Join Date: Sep 2008 Posts: 741 iTrader: (0)	The speed of the A/C seems to drop.

07-08-2012, 05:31 PM	#7
cavm335i Private First Class Drives: 2012 335i F30 Join Date: Dec 2010 Location: United States Posts: 110 iTrader: (1)	mine stays the same, the car does not turn off at lights when it's hot outside (seems to be hotter than low 90s).

07-08-2012, 05:56 PM	#8
live4wknds Private First Class Drives: 2012 328i Join Date: Apr 2012 Location: So Cal Posts: 129 iTrader: (0)	The fan slows to a lower setting, still blowing cool air. If the thermostat is set an a low temp and the cabin hasn't been cooled to that setting, the motor will restart after a brief period and the fan will resume to it's prior speed. If MAX cooling is on, ASS will not engage at a stop. I believe this is all documented in the manual.

07-08-2012, 08:43 PM	#9
omarliendo Private First Class Drives: 2012 335i Sport Line - Red Join Date: May 2012 Location: Atlanta, GA Posts: 114 iTrader: (0)	In the F30's, the AC units have been detached from the engine so the AC should stay at the same temperature that was set when the car was functioning.

07-09-2012, 07:52 AM	#10
JoeyO Lieutenant Drives: silver car Join Date: Jan 2012 Location: USA Posts: 516 iTrader: (0)	He he, he said ASS.

07-13-2012, 10:20 PM	#19
ZMM_OMG First Lieutenant Drives: '01 325i Join Date: May 2012 Location: SF Bay Area, CA Posts: 328 iTrader: (0) Garage List 2001 BMW 325i [5.00] 2009 BMC Pro Machine [0.00]	So there's a sensor that monitors my interior and shuts down my ASS if it's outside operational tolerances? Talk about a "back up" system. (Sorry... couldn't resist)

07-15-2012, 10:18 PM	#21
cavm335i Private First Class Drives: 2012 335i F30 Join Date: Dec 2010 Location: United States Posts: 110 iTrader: (1)	Yes, on warmer days it won't turn off or it will turn off but then turn back on after about a minute.

07-18-2012, 03:25 PM	#22
jonrick1 Registered Drives: 328XI Join Date: Nov 2010 Location: SF Bay Area Posts: 4 iTrader: (0)	I just downloaded the owners manual. (pp61-63). There is a button on top of the on/off switch that you can use to shut off the stop/start feture. The manual also says that when the car is stopped, the AC fan function will be reduced.