So I tried to isolate the noise and it definitely appears to be coming from the compressor, but I can't be 100% sure. The other tricky part is that the sound goes away after a minute.
Matt - I can freely turn the front of the compressor with the engine off.
I think for now I may just leave it unless the noise worsens. I'll keep an eye (ear) on it. Thanks all.
Care to be a little more specific as to the process you used when you "tried to isolate the noise"?
__________________ If the only prayer you say in your life is thank you, that would suffice. Meister Eckhart
When you learn from your own mistakes, that's experience.
When you learn from the mistakes of others, that's wisdom.
When you fail to learn from any mistakes, that's government.
Care to be a little more specific as to the process you used when you "tried to isolate the noise"?
I don't have an actual mechanic's stethoscope, so I used a slim wood dowel. Placed it as close as I could to the base of each pulley to see if I could hear the noise. Heard plenty of engine sounds, but it was hard to isolate the noise with everything moving and not a lot of room to probe.
It goes away very quickly as well, so it's hard to get the jump on it.
Nothing appears to be wobbling or loose, serpentine belt tracks well, so I think I will just monitor it for now.
Matt - yes, the compressor is engaged when the squeaking noise occurs. Happens at startup, loud at first, then dissipates until quiet, about 1 min total time.
I don't have an actual mechanic's stethoscope, so I used a slim wood dowel. Placed it as close as I could to the base of each pulley to see if I could hear the noise. Heard plenty of engine sounds, but it was hard to isolate the noise with everything moving and not a lot of room to probe.
It goes away very quickly as well, so it's hard to get the jump on it.
Nothing appears to be wobbling or loose, serpentine belt tracks well, so I think I will just monitor it for now.
Matt - yes, the compressor is engaged when the squeaking noise occurs. Happens at startup, loud at first, then dissipates until quiet, about 1 min total time.
Well, wood is an excellent sound damper. If you don't want to invest in a mechanic's steth a very long screwdriver can be used with the handle against your ear.
That said, if you're satisfied it's the compressor then you can follow the other steps outlined re: clearance, etc. Or since it is just a temporary squeak you can wait and see if it develops into something more sinister.
I don't have an actual mechanic's stethoscope, so I used a slim wood dowel. Placed it as close as I could to the base of each pulley to see if I could hear the noise. Heard plenty of engine sounds, but it was hard to isolate the noise with everything moving and not a lot of room to probe.
It goes away very quickly as well, so it's hard to get the jump on it.
Nothing appears to be wobbling or loose, serpentine belt tracks well, so I think I will just monitor it for now.
I had the EXACT same noise. It wasn't until I removed the serpentine belt that I discovered that the compressor pulley bearing was shot and wobbling.
I would advise against "monitoring" for too much longer as you could be stranded with a thrown serpentine belt. Mine was very, very close to complete failure. My theory is that it was causing so much heat, that it actually melted the clutch coil's thermofuse.
You get a new pulley and bearing with a clutch kit
__________________
1982 320i
1999 E300DT
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Well, wood is an excellent sound damper. If you don't want to invest in a mechanic's steth a very long screwdriver can be used with the handle against your ear.
That said, if you're satisfied it's the compressor then you can follow the other steps outlined re: clearance, etc. Or since it is just a temporary squeak you can wait and see if it develops into something more sinister.
Lol...were you a teacher in a past life?
Ok, back to the engine I go, novice skills intact.
Dave - thanks for the info and warning, I'll investigate it further. I'm a bit stretched for time at the moment and a lot on the plate but experience has taught me its the things you ignore that come back to bite that much harder...
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