02-22-2014, 09:11 PM | #1 |
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A permanent Fix for the 335i/435i 2500 RPM Rattle/Buzzing/Whirring Noise?
BMW has released a Technical Service Bulletin – SIB 64 01 14 for Heating and Air-conditioning for the 335i / 435i with N55 engine.
Bulletin states that there is an intermittent whirring noise from the IHKA system when the engine is under load between 2,000 and 3,000 rpm, and sometimes higher RPMs. Cause has been identified by BMWNA as vibrations coming from the A/C low-pressure hose, which are resonating into the heating and air conditioning system. (In my 335, this resonance could be heard in the cabin, and felt in the steering column.) The resonance will rattle/buzz whatever is loose in the dash. BMW has developed a new mass weight kit to dampen vibrations in the A/C low pressure hose, being transmitted from the engine. After experiencing this problem from the second week of owning my new F30, I had this kit installed today. Problem first manifested itself at about 200 miles, today I have over 4500 miles. When I applied moderate load to the engine in gears 1 to 4, there would be an unmistakable engine vibration right around 2500 RPM. My experience matches many of the videos posted by other Bimmerpost members. My dealer was earnest in attempting to isolate the problem. First repair attempt, they initially found an engine cover loose. Second repair attempt they insulated the plastic engine cowling, nav screen, AC hoses, etc. Felt tape / wrapping was applied in multiple locations. 3rd attempt, after driving the car without the dash, and still hearing the noise, they isolated the problem to the AC hose. I can’t say enough about the terrific service efforts at the dealership. They worked tirelessly, including researching the problem from the various Bimmerpost threads I sent them. After communicating with their regional BMW reps, they were told a service bulletin was coming. Bulletin was released this week, part ordered Monday, delivered Thursday, and installed today. Am very hopeful this will do the trick and I’ll finally be rattle/vibration/whirring noise free. Highlighted circle in the picture below shows the new kit installed on the A/C hose. Drove the car about 15 miles today. The vibration/buzzing/whirring sound are definitely better – but need more drive time to fully determine if this new mass weight kit has cured all ills. Last edited by Tjcf14; 02-22-2014 at 09:35 PM.. |
02-23-2014, 06:40 AM | #3 |
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The fix is under the hood? That looks like an easy fix, my 435i will be built soon so I'm hoping they added this fix from the factory.
Thanks for the info, I'm sure that will save a lot of searching for others who have this problem getting it fixed. |
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02-23-2014, 08:10 AM | #4 |
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That is great news. I have the issue but wasn't able to replicate it at the dealer. However now I know how to replicate it and will take it there soon. So they can apply the fix! Keep us posted if it comes back!
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02-23-2014, 08:31 AM | #6 |
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So this isn't the same thing as the "electrical" sounding buzz that can be heard when accelerating slowly with the radio off (has to be very quiet to hear it)? Almost sounds like electrical interference or something. Not the same?
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02-23-2014, 09:33 AM | #7 |
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02-23-2014, 11:48 AM | #8 |
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Wow, I got rid of an F30 335 because of this. Now, my new one does it too, but not as bad. If like to wait a bit to see if this works for you all before I take mine into the dealer.
I'm going to zip tie some heavy things to my hose to see if it helps... Last edited by gomichaelkgo; 02-23-2014 at 12:03 PM.. Reason: Zip ties are awesome |
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02-23-2014, 01:48 PM | #9 |
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Wow, this is great news. Keep us updated in whether the rattle creeps up again. I was having this issue as well. Hopefully, this completely fixes the issue.
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02-23-2014, 02:17 PM | #10 |
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Great find! Is there a ID or Number for this Service Bulletin?
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02-23-2014, 07:40 PM | #11 |
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What's interesting is that this hose already has weight attached 5-10 inches upstream. It's hard to believe that rubber hose would cause this noise. What's the connection between low pressure ac hose and engine under load at 2500 rpm.
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02-23-2014, 09:43 PM | #12 |
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What is the plastic shroud I have circled in yellow? My 2014 335i does not have this shroud. I can see wires. connectors etc. where you have a shroud.
My neighbors 2013 is same as mine. Maybe BMW added after July 2013 builds?
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02-24-2014, 05:24 AM | #15 | |
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Quote:
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02-24-2014, 08:26 AM | #20 | |
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02-24-2014, 08:27 AM | #21 |
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Holy crap thanks for posting. Through my testing I knew it was AC related as I've posted many times before. I thought it was a vent but apparently it was a hose. Still doubtful it is that but I can't wait to go to the dealership.
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02-24-2014, 09:39 AM | #22 |
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I was wondering too. August 2013 build and no cover for me. Is it what the hose is supposedly vibrating against?
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