FAN and AC come on by itself out of no where?

5soko · 06-18-2010, 04:05 PM

I was thinking i forgot my AC on and i pressed it by accident on my steering wheel or something, but today sitting in my car with the key in the ignition the car on idle, it was pretty hot out, the fan and AC came on byitself like i pressed the fan + button. And im pretty sure it happened twice before on its own aswell.
It turns on the the last settings i had it on.

Anyone else have this issue?

My car is a 11/09 build, and just got my software updated for long cranks about a week ago.

BillLee · 06-18-2010, 04:41 PM

wondering the same thing. it happened to me once, then it stopped the next day.

Baoer · 06-18-2010, 05:14 PM

this happened to me before i got a software update...i was driving and after every bump on the road or so, it would turn on when i know I TURNED IT OFF....i have an 09

5soko · 06-18-2010, 06:13 PM

I cleaned my windsheild, the temp sensor on the FAN/AC unit and the other sensor on the dash in the middle.

Check all the setting to make sure nothing is in auto mode and i am gonna make sure i dont press the RECUR button on the steering wheel.

Gonna go for a nice long driver tonite and sunday so i will keep updated on what happens.

codes i have gotten are 2FCA and 2FDA, but other have gotten this and not have the FAN/AC ghost problem, so these codes arent related.

PhiDeltBeers · 06-24-2010, 05:05 PM

Quote:

Originally Posted by 5soko335i

I cleaned my windsheild, the temp sensor on the FAN/AC unit and the other sensor on the dash in the middle.

Check all the setting to make sure nothing is in auto mode and i am gonna make sure i dont press the RECUR button on the steering wheel.

Gonna go for a nice long driver tonite and sunday so i will keep updated on what happens.

codes i have gotten are 2FCA and 2FDA, but other have gotten this and not have the FAN/AC ghost problem, so these codes arent related.

What are those codes? I have them as well.

psun · 06-25-2010, 12:06 PM

Just happened to me recently for a day and has stopped.. Hasn't come on again by itself. Weird.. I have an 08 model.

Edward · 06-25-2010, 12:11 PM

On older BMW's, there was a very similar problem where the fan speed would not regulate itself and it'd blast air and then lower and then back up and it was very erratic. This was caused by a fauly "final stage resistor." Maybe look into whether that component is what is causing your issue? I'm not sure how to interpret codes or anything.

5soko · 07-02-2010, 01:47 PM

Just to update this, i cleaned the temp sensor on the AC console and set everything to manual nothing auto and this has not happened to me ever since.

Quote:

Originally Posted by PhiDeltBeers

What are those codes? I have them as well.

I have no idea what these codes are still.. I havent deleted them and they have not gone away. I am going to delete them soon and see they if they come back.

m@rco · 07-03-2010, 08:53 PM

Something appears to be wrong. In any event, make sure that you make use of the same key. If you use your spare, it will adjust the settings to its last setting.

06-18-2010, 04:05 PM	#1
5soko Brigadier General 333 Rep 4,632 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	FAN and AC come on by itself out of no where? I was thinking i forgot my AC on and i pressed it by accident on my steering wheel or something, but today sitting in my car with the key in the ignition the car on idle, it was pretty hot out, the fan and AC came on byitself like i pressed the fan + button. And im pretty sure it happened twice before on its own aswell. It turns on the the last settings i had it on. Anyone else have this issue? My car is a 11/09 build, and just got my software updated for long cranks about a week ago.
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06-18-2010, 04:41 PM	#2
BillLee Major General 679 Rep 5,382 Posts Drives: E92 M3 Join Date: Oct 2007 Location: HTX iTrader: (21) Garage List 09 E92 M3 [9.00]	wondering the same thing. it happened to me once, then it stopped the next day. __________________ Follow me on instagram: billy.by
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06-18-2010, 05:14 PM	#3
Baoer Second Lieutenant 15 Rep 207 Posts Drives: AW 335i Coupe Join Date: Feb 2009 Location: OC, CA iTrader: (1)	this happened to me before i got a software update...i was driving and after every bump on the road or so, it would turn on when i know I TURNED IT OFF....i have an 09
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06-18-2010, 06:13 PM	#4
5soko Brigadier General 333 Rep 4,632 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	I cleaned my windsheild, the temp sensor on the FAN/AC unit and the other sensor on the dash in the middle. Check all the setting to make sure nothing is in auto mode and i am gonna make sure i dont press the RECUR button on the steering wheel. Gonna go for a nice long driver tonite and sunday so i will keep updated on what happens. codes i have gotten are 2FCA and 2FDA, but other have gotten this and not have the FAN/AC ghost problem, so these codes arent related.
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06-25-2010, 12:06 PM	#6
psun Private First Class 23 Rep 101 Posts Drives: F80, F82, E90 Join Date: Mar 2010 Location: Texas iTrader: (0) Garage List 2011 BMW M3 [0.00]	Just happened to me recently for a day and has stopped.. Hasn't come on again by itself. Weird.. I have an 08 model.
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06-25-2010, 12:11 PM	#7
Edward Colonel 377 Rep 2,982 Posts Drives: 2013.9999 E92 Jerez ZCP Join Date: May 2010 Location: Los Angeles iTrader: (2)	On older BMW's, there was a very similar problem where the fan speed would not regulate itself and it'd blast air and then lower and then back up and it was very erratic. This was caused by a fauly "final stage resistor." Maybe look into whether that component is what is causing your issue? I'm not sure how to interpret codes or anything.
	Appreciate 0 Quote

07-03-2010, 08:53 PM	#9
m@rco First Lieutenant 23 Rep 322 Posts Drives: '20 540i; '07 328i; '03 R1150R Join Date: Dec 2009 Location: Boston iTrader: (0)	Something appears to be wrong. In any event, make sure that you make use of the same key. If you use your spare, it will adjust the settings to its last setting.
	Appreciate 0 Quote