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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 04-22-2014, 10:08 AM
scotydnt scotydnt is offline
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Air conditioner surging

Need some advice. I have a 2011 335i. With the AC on and at low fan speed it sounds like the blower motor is increasing speed for a couple seconds then decreases for a couple seconds and keeps repeating the process. With the AC off the surging stops. Also, the other settings do not matter ie re circulation, auto, temp setting... Has anyone else heard of this issue? If so, is it an issue or normal operations? Thanks


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  #2  
Old 04-22-2014, 10:11 AM
fdriller9 fdriller9 is offline
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What is surging?

The air flow out of the vents?

Or the compressor/engine?
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  #3  
Old 04-22-2014, 10:13 AM
scotydnt scotydnt is offline
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Air flow from the vents. Definitely not an engine issue


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  #4  
Old 04-22-2014, 11:05 AM
birdman15 birdman15 is offline
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low refrigerant in the a/c system sounds like. The compressor kicking on & off.
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  #5  
Old 04-22-2014, 11:18 AM
White94RX White94RX is offline
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The compressor cycling has nothing to do with the blower motor

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  #6  
Old 04-22-2014, 11:21 AM
birdman15 birdman15 is offline
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not saying it does BUT with the A/C off he says the surging stops..........
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Old 04-22-2014, 11:24 AM
scotydnt scotydnt is offline
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Quote:
Originally Posted by birdman15 View Post
low refrigerant in the a/c system sounds like. The compressor kicking on & off.

If the refrigerant was low wouldn't the AC shut down?


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  #8  
Old 04-22-2014, 11:26 AM
birdman15 birdman15 is offline
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Quote:
Originally Posted by scotydnt View Post
If the refrigerant was low wouldn't the AC shut down?


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no it would build pressure cycle then kick out when pressure drops.
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  #9  
Old 04-22-2014, 11:37 AM
scotydnt scotydnt is offline
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Quote:
Originally Posted by birdman15 View Post
no it would build pressure cycle then kick out when pressure drops.

Worth a shot. I would prefer servicing the system vs. finding a bad sensor or actuator


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  #10  
Old 04-22-2014, 11:44 AM
fdriller9 fdriller9 is offline
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It's very common for the blower motor bearings to rust and the motor seizes. Sounds like yours is about to seize.

Check you windshield cowl cover. Is there a gap between the glass and be rubber seal?

If so, fix the cowl first. A leaking cowl will allow water to drop onto the blower motor, accelerating the failure rate.

Most of the time, you can dissemble the motor and remove the rust, grease the bearings and shaft, then reinstall.
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  #11  
Old 04-22-2014, 12:05 PM
wilt wilt is offline
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It could also be that the temperature sensor is unstable, causing the system to think it needs to blow more air in to cool the interior to the desired temperature, then it thinks it is cool enough and slows the fan, before again deciding it needs to ramp up the fan speed.
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Old 04-22-2014, 12:06 PM
scotydnt scotydnt is offline
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Quote:
Originally Posted by fdriller9 View Post
It's very common for the blower motor bearings to rust and the motor seizes. Sounds like yours is about to seize.

Check you windshield cowl cover. Is there a gap between the glass and be rubber seal?

If so, fix the cowl first. A leaking cowl will allow water to drop onto the blower motor, accelerating the failure rate.

Most of the time, you can dissemble the motor and remove the rust, grease the bearings and shaft, then reinstall.

Ok. If I have a fouled motor wouldn't the surge happen all the time, not just when the AC is on?


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  #13  
Old 04-22-2014, 12:12 PM
scotydnt scotydnt is offline
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Quote:
Originally Posted by wilt View Post
It could also be that the temperature sensor is unstable, causing the system to think it needs to blow more air in to cool the interior to the desired temperature, then it thinks it is cool enough and slows the fan, before again deciding it needs to ramp up the fan speed.

From what I've seen there are at least two temp sensors. Is there a way to check if one is bad or just swap in a new one and see what happens?


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  #14  
Old 04-22-2014, 02:05 PM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by scotydnt View Post
Ok. If I have a fouled motor wouldn't the surge happen all the time, not just when the AC is on?


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Ohh I thought you meant that it stops when you turn off the entire system, not just the AC.
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  #15  
Old 04-22-2014, 02:26 PM
mossman35 mossman35 is offline
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Does it do this in relation to vehicle speed? Our cars increase fan speed with vehicle speed. It's in the manual. If it has nothing to do with vehicle speed, then must be something mentioned above.
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  #16  
Old 04-22-2014, 02:37 PM
scotydnt scotydnt is offline
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Air conditioner surging

Quote:
Originally Posted by mossman35 View Post
Does it do this in relation to vehicle speed? Our cars increase fan speed with vehicle speed. It's in the manual. If it has nothing to do with vehicle speed, then must be something mentioned above.

Now that you mention it, I've only noticed in stop and go traffic(slow/stop). Also it doesn't increase with my relative speed, it surges on it's own no matter if I'm going slow or stopped. Not sure if it happens when I'm on the interstate. If it changes with vehicle speed do I need to look in a different place? Also by fan speed to you mean the fan on the radiator or the blower motor?


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Last edited by scotydnt; 04-22-2014 at 02:45 PM.
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  #17  
Old 04-22-2014, 02:46 PM
mossman35 mossman35 is offline
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Quote:
Originally Posted by scotydnt View Post
Now that you mention it, I only noticed in stop and go traffic(slow/stop). Also it doesn't increase with my relative speed, it surges on it's own no matter if I'm going slow or stopped. Not sure if it happens when I'm on the interstate. If it changes with vehicle speed do I need to look in a different place? Also by fan speed to you mean the fan on the radiator or the blower motor?


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By fan speed, I mean the blower speed. The car compensates for pressure differences at speed. So... as you speed up, you will get more air blowing into the cabin. It's not really noticeable until it's warm outside and the dash vents are being used more.

It's one of those things where once you notice it, it's hard not to notice it. I notice it much more on sunny warm days when I am in stop and go traffic.

If it is this, it shouldn't "surge" at a constant speed.
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  #18  
Old 04-22-2014, 03:04 PM
scotydnt scotydnt is offline
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Quote:
Originally Posted by mossman35 View Post
By fan speed, I mean the blower speed. The car compensates for pressure differences at speed. So... as you speed up, you will get more air blowing into the cabin. It's not really noticeable until it's warm outside and the dash vents are being used more.

It's one of those things where once you notice it, it's hard not to notice it. I notice it much more on sunny warm days when I am in stop and go traffic.

If it is this, it shouldn't "surge" at a constant speed.

Aaahhh ok I know what you're talking about. Yeah that happens as well. Much more noticeable the faster the blower motor is going. I figured it was to aid in the life of the battery.

What I'm experiencing is something different.


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  #19  
Old 04-22-2014, 03:34 PM
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Keyser Soze Keyser Soze is offline
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sure as heck sounds like the Final Stage Resistor to me (had that issue on my old E46)
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Old 04-22-2014, 04:05 PM
scotydnt scotydnt is offline
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Air conditioner surging

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Originally Posted by Keyser Soze View Post
sure as heck sounds like the Final Stage Resistor to me (had that issue on my old E46)

Would the resistor only act screwy when the AC is on? Seems if it was that it would also act weird when the AC is off and I'm just using ambient or heated air in the car.

Also, do the E90's have this or is it in the blower regulator?


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Last edited by scotydnt; 04-22-2014 at 04:09 PM.
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  #21  
Old 04-22-2014, 05:00 PM
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Keyser Soze Keyser Soze is offline
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Yeah, the E46 would pulse if AC/Heater/Fan were on......

E90's are definitely running into the prob although seems a bit early on a 2011....

https://www.bimmerfest.com/forums/sh...d.php?t=420688
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Old 04-22-2014, 06:09 PM
scotydnt scotydnt is offline
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Quote:
Originally Posted by Keyser Soze View Post
Yeah, the E46 would pulse if AC/Heater/Fan were on......

E90's are definitely running into the prob although seems a bit early on a 2011....

https://www.bimmerfest.com/forums/sh...d.php?t=420688
Mine only happens when I turn the A/C on. Other than that it works fine. Something related to the A/C.
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  #23  
Old 04-22-2014, 08:29 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by fdriller9 View Post
It's very common for the blower motor bearings to rust and the motor seizes. Sounds like yours is about to seize.

Check you windshield cowl cover. Is there a gap between the glass and be rubber seal?

If so, fix the cowl first. A leaking cowl will allow water to drop onto the blower motor, accelerating the failure rate.

Most of the time, you can dissemble the motor and remove the rust, grease the bearings and shaft, then reinstall.

Might be it.

Too bad we don't have oscillating fans like Lexus! Wouldn't buy another, but the fan was slick....
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Old 08-23-2014, 05:00 PM
scotydnt scotydnt is offline
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Update! Think I have a fix. Replaced the battery and everything seems to be working fine. Felt compelled to follow up since i really hate trying to find info on other issues and read through 25000 pages to discover no one mentions what the fix is/was. Anyway, it seems a low battery will cause all kinds of goofy issues in this car...good times!
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  #25  
Old 08-23-2014, 05:47 PM
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DSXMachina DSXMachina is offline
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Park with your headlamps on high beam and pointed at a wall. Start the engine and let it warm up. Let the engine idle. Run the AC system with the temperature set to the lowest setting, and with your blower fan in different speeds. Listen for a non-requested change in blower speeds.
1. Does the blower speed vary on its own regardless of the speed you select?
2. Do you see ANY change in headlamp brightness when you sense a non-requested change in blower speed?
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