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DIY: Do It Yourself
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Old 05-02-2015, 11:28 AM   #1
FernandoC
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Question Anyone familiar with this sound??



It comes on after a few minutes of driving. When the engine is cold, nothings heard.

I assumed it was a pulley or a belt, but all tensioners, belts and pulleys were changed about 30K miles ago. (maybe it is due time to change them again?)

It does seem to come from the engine it self and not the belts area, but not 100% sure as its hard to tell in that tight space

May be unrelated, but I am also loosing some coolant (low coolant light comes on about every month or so) no leaks, but could this mean i have a hairlive crack in the exp tank or a hose and maybe coolant is leaking onto a belt? Alreayd ordered the cooling sys refresh parts (hoping it will fix this issue and nothing bigger)

Anyone has any input, I thank you very much. I am a new DIYer and im sorry if this is something really small I missed.
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Old 05-02-2015, 03:37 PM   #2
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Try using a stethoscope to help you pinpoint the location. You can also try turning on and off your AC, to help remove that out of the equation.

a quick video on what i mean:
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Old 05-09-2015, 05:10 AM   #3
big bad jon
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When was the water pump changed? If you're having coolant issues, maybe it's a bad bearing in the water pump?

It sounds like a pulley, but since you said they were replaced...

It could also be a bad belt. Some belts just don't play well for whatever reason, and can squeak
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Old 05-09-2015, 07:44 AM   #4
FernandoC
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Originally Posted by big bad jon View Post
When was the water pump changed? If you're having coolant issues, maybe it's a bad bearing in the water pump?

It sounds like a pulley, but since you said they were replaced...

It could also be a bad belt. Some belts just don't play well for whatever reason, and can squeak


Water pump thermostat and all tensioners belts and pulleys were replaced about 45000 KM ago. Sounds only comes up close to idle and when engine warm.
Might have to get my hands dirty to figure this one out.
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Old 05-12-2015, 08:04 AM   #5
330iPilot
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Alternator bearings I think.
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Old 05-12-2015, 09:00 AM   #6
FernandoC
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Alternator bearings I think.
I'm getting an bunch of cooling system stuff this week. I will be checking this out then. Hopefully its not too bad
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Old 05-12-2015, 10:31 AM   #7
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Take the belts off and spin the pulleys. Should be obvious which is the one.
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Old 05-21-2015, 10:44 PM   #8
FernandoC
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Take the belts off and spin the pulleys. Should be obvious which is the one.
I did it, but nothing seems off with the pulleys. The sound also ONLY comes when the engine is well warmed up. I'm thinking its one of the two plastic pulleys.
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