Climate control abruptly stopped working

Phil G · 06-15-2011, 08:17 PM

Ok, so my A/C just randomly shut off. However, the climate control display still is working, and the display changes when I change the controls, like the A/C actually is functioning. Any idea what could be causing this?

AndreyT · 06-15-2011, 09:10 PM

What exactly do you mean by "display changes when I change the controls, like the A/C actually is functioning"? AFAIK, there no indication on the actual LCD display whether the A/C is functioning or not. The only A/C indicator on the climate control panel is that little green LED on the A/C button (the one with the snowflake on it). The fact that you can change the temperature value shown on the display has absolutely nothing to do with your A/C functioning or not.

When your A/C randomly shuts off (as you say), what happens to that little green LED? Does the LED shut off as well? Or the LED stays on (as if the A/C is on), but you feel that there's no cold air coming from the vents?

P.S. After rereading your post I figured that you probably are using the terms "A/C" and "climate control" interchangeably (even though these are not the same). If so, you need to provide more details about what exactly is not working. The fan is not blowing? The heater is not heating? The actual A/C is not cooling? Something else?

Phil G · 06-15-2011, 11:28 PM

The fan has stopped blowing all together. Sorry I wasn't more clear, I have no idea if the A/C is working...no air is coming out of the vents. Basically I'll put it this way...for me, it has always been if the fan is not blowing, NOTHING shows up on the LED display. Now the display is lit up (as if the fan is operating), and nothing is coming out of the vents. Almost as if the controls are not communicating with the rest of the climate control system. Does that make sense at all?

Alexm007 · 06-16-2011, 12:19 AM

This is a common problem, this could be what is called the "final stage unit" or "blower motor resistor".

Do a

and you will find information and the experiences of others.

Good luck!

Phil G · 06-16-2011, 09:23 AM

I just did a search, I would be willing to bet that's it, based off of everyone else's experience. I'll look into it. Thanks!

06-15-2011, 08:17 PM	#1
Phil G Dominator of Deep South curvy roads 57 Rep 340 Posts Drives: '07 335i Coupe Join Date: Apr 2006 Location: Atlanta, GA iTrader: (0)	Climate control abruptly stopped working Ok, so my A/C just randomly shut off. However, the climate control display still is working, and the display changes when I change the controls, like the A/C actually is functioning. Any idea what could be causing this? __________________ -'07 335i coupe (build date 02/2007) - Space Grey/Black Dakota/Dark Burl - 6MT/ZPP/ZSP/Nav/CA/Heated Seats. Acquired in Munich 3/2007 via European Delivery. 16 years and almost 220k miles of pure joy! -'06 911 Carrera S - Black/Black - Full Leather/Sport Chrono/Porsche Sport Exhaust/Nav - 80k miles. Acquired 1/2021. One needy old German car just wasn't enough!
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06-15-2011, 09:10 PM	#2
AndreyT Major 59 Rep 1,038 Posts Drives: 2011 335i Sedan, Sport Join Date: Feb 2011 Location: Northern California iTrader: (0)	What exactly do you mean by "display changes when I change the controls, like the A/C actually is functioning"? AFAIK, there no indication on the actual LCD display whether the A/C is functioning or not. The only A/C indicator on the climate control panel is that little green LED on the A/C button (the one with the snowflake on it). The fact that you can change the temperature value shown on the display has absolutely nothing to do with your A/C functioning or not. When your A/C randomly shuts off (as you say), what happens to that little green LED? Does the LED shut off as well? Or the LED stays on (as if the A/C is on), but you feel that there's no cold air coming from the vents? P.S. After rereading your post I figured that you probably are using the terms "A/C" and "climate control" interchangeably (even though these are not the same). If so, you need to provide more details about what exactly is not working. The fan is not blowing? The heater is not heating? The actual A/C is not cooling? Something else? Last edited by AndreyT; 06-15-2011 at 09:32 PM..
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06-15-2011, 11:28 PM	#3
Phil G Dominator of Deep South curvy roads 57 Rep 340 Posts Drives: '07 335i Coupe Join Date: Apr 2006 Location: Atlanta, GA iTrader: (0)	The fan has stopped blowing all together. Sorry I wasn't more clear, I have no idea if the A/C is working...no air is coming out of the vents. Basically I'll put it this way...for me, it has always been if the fan is not blowing, NOTHING shows up on the LED display. Now the display is lit up (as if the fan is operating), and nothing is coming out of the vents. Almost as if the controls are not communicating with the rest of the climate control system. Does that make sense at all? __________________ -'07 335i coupe (build date 02/2007) - Space Grey/Black Dakota/Dark Burl - 6MT/ZPP/ZSP/Nav/CA/Heated Seats. Acquired in Munich 3/2007 via European Delivery. 16 years and almost 220k miles of pure joy! -'06 911 Carrera S - Black/Black - Full Leather/Sport Chrono/Porsche Sport Exhaust/Nav - 80k miles. Acquired 1/2021. One needy old German car just wasn't enough!
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06-16-2011, 12:19 AM	#4
Alexm007 Second Lieutenant 20 Rep 220 Posts Drives: '19 G01 X3, 09 E70,07 E92 335i Join Date: Sep 2010 Location: Antarctica iTrader: (3)	This is a common problem, this could be what is called the "final stage unit" or "blower motor resistor". Do a and you will find information and the experiences of others. Good luck! __________________ Current: 2019 G01 X3 Before that: 2009 e70 X5 Before that: 2007 BMW 335i Coupe - ZSP
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06-16-2011, 09:23 AM	#5
Phil G Dominator of Deep South curvy roads 57 Rep 340 Posts Drives: '07 335i Coupe Join Date: Apr 2006 Location: Atlanta, GA iTrader: (0)	I just did a search, I would be willing to bet that's it, based off of everyone else's experience. I'll look into it. Thanks! __________________ -'07 335i coupe (build date 02/2007) - Space Grey/Black Dakota/Dark Burl - 6MT/ZPP/ZSP/Nav/CA/Heated Seats. Acquired in Munich 3/2007 via European Delivery. 16 years and almost 220k miles of pure joy! -'06 911 Carrera S - Black/Black - Full Leather/Sport Chrono/Porsche Sport Exhaust/Nav - 80k miles. Acquired 1/2021. One needy old German car just wasn't enough!
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