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      04-12-2019, 06:04 PM   #1
tomwadek
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chasing a Squeaking Sound from engine and coolant leak

Hi everyone,

I have a 2011 335i N55 and I've been chasing both issues for some time. The first issue is a squeaking belt and the second a coolant leak.

First issue:
I've changed out the tensioner, belt, and both Idle pulleys twice. The sound is immediate with new parts.

I've tightened the power steering pulley.

Ran the car with the belt off ( sound goes away)

I don't know what is causing this sound and I'm afraid of driving it and the belt shredding. There seems to be a small oil leak coming from the OFHG which I had changed last year (only lasted a year) but like I said the sound is instant even after a belt, tensioner, and idle pulleys change. All parts are from the dealer.

Video link:


Second issue:

I have a pretty bad coolant leak coming from the passenger side. I can see a trail from under the car but nothing from the top of the car which makes me think this is somewhere in the middle.

6 months ago I put in a new radiator (because it was cracked from the top hose inlet) and new coolant reservoir. I didn't have any leaks until now. any idea of where it could be coming from?

Video link:
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      04-12-2019, 06:07 PM   #2
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      04-12-2019, 06:08 PM   #3
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Quote:
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+1
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      04-12-2019, 06:27 PM   #4
tomwadek
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I have a stethoscope.

seems to be coming from the tensioner area but I've changed it twice...
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      04-12-2019, 09:20 PM   #5
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Any help on troubleshooting the coolant leak?
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      04-12-2019, 09:55 PM   #6
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Probably a bad PCV valve in the VC. Search and you will find plenty of threads.
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      04-12-2019, 11:41 PM   #7
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Squeaking could perhaps be the alternator pulley. Search for "alternator decoupler pulley" to find a few methods of testing it. Gates has a video on it.
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      04-15-2019, 08:49 AM   #8
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Updated

I have chased the sound and it's coming from the general location of the OFHG and belt tensioner. It almost sounds like a vacuum leak when I rev the motor up but then goes away above 1500 RPMs.

As far as the leak goes, I cant find where it's coming from. Sometime sit leaks and sometimes it doesn't. Only thing that I can think of is a cracked radiator.
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      04-15-2019, 08:34 PM   #9
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Had my 2013 e92's OFHG replaced on 4/10.
Just purchased the thing on the 4/4 w/77k odo from Mercedes of Monterey.
Immaculate in and out. Not a blemish.
Same problem your having and just noticed it pulling into the garage. Please post an update when you nail this gremlin. Thanks.
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      04-16-2019, 04:50 PM   #10
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Quote:
Originally Posted by tomwadek View Post
Any help on troubleshooting the coolant leak?
It's really tricky to diagnose an intermittent coolant leak. Your best bet would be to use a UV dye test to poinpoint the source.

But first take a look at some of the obvious places. I once had a mysterious coolant leak. After I bought my car, I did several drains and fills of my radiator with distilled water to flush out all the (incorrect) green coolant that the previous owner installed when he had the water pump and thermostat replaced. After I got clear water draining out the final fill was with the correct BMW coolant. I drove around for weeks with no problems then one day while I had my car idling in the driveway I noticed a steady stream of coolant dripping onto the ground. I thought it was a cracked radiator but it ended up being the drain plug at the bottom of the radiator that I overtightened. I loosened it then retightened it, and all has been good since then. I found it strange that I didn't touch the drain plug and it held fine for weeks, then randomly one day it started to leak. However after I properly torqued it, it hasn't leaked since.
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      04-19-2019, 09:00 AM   #11
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Updated

Quote:
Originally Posted by lowrydr310 View Post
It's really tricky to diagnose an intermittent coolant leak. Your best bet would be to use a UV dye test to poinpoint the source.

But first take a look at some of the obvious places. I once had a mysterious coolant leak. After I bought my car, I did several drains and fills of my radiator with distilled water to flush out all the (incorrect) green coolant that the previous owner installed when he had the water pump and thermostat replaced. After I got clear water draining out the final fill was with the correct BMW coolant. I drove around for weeks with no problems then one day while I had my car idling in the driveway I noticed a steady stream of coolant dripping onto the ground. I thought it was a cracked radiator but it ended up being the drain plug at the bottom of the radiator that I overtightened. I loosened it then retightened it, and all has been good since then. I found it strange that I didn't touch the drain plug and it held fine for weeks, then randomly one day it started to leak. However after I properly torqued it, it hasn't leaked since.
Thank you, i'm going to try another go at it next week.

The coolant leak looks like it's coming from just above the inner cooler hose on the driver side. There is a smaller return hose that bolts onto the radiator using a T25 screw and at first I thought it was coming from there but now i'm not sure.
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      04-19-2019, 09:59 AM   #12
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Quote:
Originally Posted by tomwadek View Post
Hi everyone,

I have a 2011 335i N55 and I've been chasing both issues for some time. The first issue is a squeaking belt and the second a coolant leak.

First issue:
I've changed out the tensioner, belt, and both Idle pulleys twice. The sound is immediate with new parts.

I've tightened the power steering pulley.

Ran the car with the belt off ( sound goes away)

I don't know what is causing this sound and I'm afraid of driving it and the belt shredding. There seems to be a small oil leak coming from the OFHG which I had changed last year (only lasted a year) but like I said the sound is instant even after a belt, tensioner, and idle pulleys change. All parts are from the dealer.

Video link:


Second issue:

I have a pretty bad coolant leak coming from the passenger side. I can see a trail from under the car but nothing from the top of the car which makes me think this is somewhere in the middle.

6 months ago I put in a new radiator (because it was cracked from the top hose inlet) and new coolant reservoir. I didn't have any leaks until now. any idea of where it could be coming from?

Video link:
I'm dealing with a similar squealing sound. I believe the pulley on the AC condenser was the cause so I got a smaller belt, deleted the ac from the belt system and it went away, for a while. I was using a 435K6 but the squeal came back as I don't think it puts enough tension on the system. I'm hoping to get a 433K6 and that it's tight enough.
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      04-19-2019, 03:02 PM   #13
tomwadek
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Updated

Interesting, My brother noticed a whistling sound coming from the engine bay when I was pulling out of his parking lot.
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