[m7ammed]

Originally Posted by Tjcf14

Dealership would not provide a hard copy for me to keep. My initial post has the bulletin number. Your dealer should be able to look up.

Thanks, I'm guessing since this is issued through BMW NA it might take a while to spread over here. I've given the SIB number to the dealer, and suggested they contact BMW middle east to escalate the issue.

[claykin]

Originally Posted by ft1330

I was wondering too. August 2013 build and no cover for me. Is it what the hose is supposedly vibrating against?

More than likely that cover is unrelated to the pipe vibration issue. Seems the pipe is vibrating and the resonance of this vibration is passing through the firewall to the components inside the car (which is what you hear).

My guess is that cover is an afterthought to protect the wiring and piping in that area. I['m trying to locate it on REALOEM, but no luck so far.

[BavarianFanatic]

Originally Posted by claykin

More than likely that cover is unrelated to the pipe vibration issue. Seems the pipe is vibrating and the resonance of this vibration is passing through the firewall to the components inside the car (which is what you hear).

My guess is that cover is an afterthought to protect the wiring and piping in that area. I['m trying to locate it on REALOEM, but no luck so far.

REALOEM lags by a month or more at times.

[claykin]

Looks like the low pressure AC pipe was modified starting 10/2013 production. Very likely to address this issue.

http://www.realoem.com/bmw/showparts...24&hg=64&fg=60

[ft1330]

Originally Posted by claykin

Looks like the low pressure AC pipe was modified starting 10/2013 production. Very likely to address this issue.

http://www.realoem.com/bmw/showparts...24&hg=64&fg=60

I see that. So the kit mentioned in the SIB by OP is likely to just be this exact OEM part? Not some half-baked fix?

Wow I hope this is really the fix, this has caused me a lot of headaches trying to pinpoint this one. I got close because it seems to fluctuate with different AC settings.

EDIT: A $160 hose

[claykin]

Originally Posted by BavarianFanatic

REALOEM lags by a month or more at times.

I know, but OP has a car with the new shroud and he said he has some miles on it, so the car has to be at least a few months old production. Shroud was not listed on service ticket so I have to assume it was factory installed.

This is the only thing I can find. Parts 8 and 18. Not sure, but will check when I take my car in for the fix. Dealer ordered parts today. Fix should be in place by Friday, I hope. Seems like a real quick install.

http://www.realoem.com/bmw/showparts...39&hg=12&fg=31

[ft1330]

Originally Posted by claykin

This is the only thing I can find. Parts 8 and 18. Not sure, but will check when I take my car in for the fix. Dealer ordered parts today.

http://www.realoem.com/bmw/showparts...39&hg=12&fg=31

Wait you had him order the plastic cover too? How did you justify this?

[claykin]

Originally Posted by ft1330

I see that. So the kit mentioned in the SIB by OP is likely to just be this exact OEM part? Not some half-baked fix?

Wow I hope this is really the fix, this has caused me a lot of headaches trying to pinpoint this one. I got close because it seems to fluctuate with different AC settings.

EDIT: A $160 hose

I'd say its a half baked fix. Check a 10/2013+ production car and I bet the hose is more modified than the weight and clamp added in the SIB.

[claykin]

Originally Posted by ft1330

Wait you had him order the plastic cover too? How did you justify this?

No, parts in bulletin were ordered. I'll ask about the cover when I take car in. My shop foreman knows me fairly well so he won't be surprised when I ask ???? He's a 3 series driver too so he'll be curious too (hopefully). He's a busy guy, and I appreciate him taking the time to show interest in my issues.

Reality is he won't be able to add the cover unless there's a bulletin or recall telling them to do it for my VIN/production month. If 11/2013 cars got it through normal production improvements, and BMWAG doesn't see the need to retrofit older cars, then that's the way it will be.

[ft1330]

It's pretty amazing how a rubber hose can create that much noise inside the cabin. It must be vibrating against something to create noise? Then shouldn't that "something" it's vibrating against, be secured better, rather than hoping to lower the vibration with a weight? Just a random thought.

[ft1330]

Originally Posted by claykin

No, parts in bulletin were ordered. I'll ask about the cover when I take car in. My shop foreman knows me fairly well so he won't be surprised when I ask ???? He's a 3 series driver too so he'll be curious too (hopefully). He's a busy guy, and I appreciate him taking the time to show interest in my issues.

Reality is he won't be able to add the cover unless there's a bulletin or recall telling them to do it for my VIN/production month. If 11/2013 cars got it through normal production improvements, and BMWAG doesn't see the need to retrofit older cars, then that's the way it will be.

Yeah I thought I had a good relationship with my foreman especially that I got rear-ended while doing a test drive with him while chasing this rattle... I guess that brings us closer? lol. And today while trying to get a fix with this SIB, I've learned that he had been involved in a car accident and won't be back in a long time And my SA was fired or something. Oh and the dealership is changing management too. This rattle has been a nightmare.

[Tjcf14]

I have a 9/13 build date. So far so good. Put on 75 miles today in both local and interstate traffic, and no vibration/rattle/or whirring. Changed settings on AC a few times.

[claykin]

Originally Posted by Tjcf14

I have a 9/13 build date. So far so good. Put on 75 miles today in both local and interstate traffic, and no vibration/rattle/or whirring. Changed settings on AC a few times.

BTW, the Buzz/rattle seems to be much worse when AC is not running (low pressure pipe not under any pressure).

[claykin]

Originally Posted by ft1330

It's pretty amazing how a rubber hose can create that much noise inside the cabin. It must be vibrating against something to create noise? Then shouldn't that "something" it's vibrating against, be secured better, rather than hoping to lower the vibration with a weight? Just a random thought.

Based on whats under my hood, that pipe is not vibrating against anything. Its the resonance vibration from engine thats being transmitted into engine compartment. The pipe is like a conduit of noise from engine.

[Tjcf14]

Originally Posted by claykin

Buzz/rattle seems to be much worse when AC is not running (low pressure pipe not under any pressure).

I had opposite experience. AC on caused more resonance to be transmitted.

[claykin]

Originally Posted by Tjcf14

I had opposite experience. AC on caused more resonance to be transmitted.

So you have a 9/13 build? Trying to figure out why you have that cover to the right of the AC low pressure pipe. Can't locate it on Realoem associated with 9/13+ builds. Is your car xDrive? 8AT or manual? Trying to figure this out...

[Tjcf14]

Yes 9/13. 8AT. Munich build. MSport, Vss/Dhp, not Xdrive.

[claykin]

Originally Posted by Tjcf14

Yes 9/13. 8AT. Munich build. MSport, Vss/Dhp, not Xdrive.

Same as me except mine is 7/13. Would you mind taking a couple more pics showing that cover? I want to show to my Foreman in case they don't have a 9/13+ 335 around when I take in for the clamp job.

[Tjcf14]

Sure thing. See attached.

[claykin]

Originally Posted by Tjcf14

Sure thing. See attached.

Thank you. Looks like a simple splash cover, rather than a full enclosure. Since water shouldn't enter from top (except owners who wash their engine bay down with water), my guess is the cover was added to avoid damage to wires and maybe provide some protection to connectors from soiling.

[Audifan]

Originally Posted by Tjcf14

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.

Great post. I'm in Toronto, I have phoned a couple dealers, they haven't heard of the bulletin. I guess I may have to wait a while....do you know if this is something they can look up in their system?

[BMHunden]

I'm having the fix installed first thing tomorrow morning. I will keep you guys updated as to whether it is successful (it may take me a while to confirm). Thank you SO much OP.