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My F makes a strange whirring/chirping noise at 1500-1700 rpm. This only happens once the engine has warmed up, after 20 minutes or so. The noise seems to come from somewhere behind my right ear. I took it to the garage, but they "found nothing". I suspect they didn't run the engine for long enough to warm up. Has anyone experienced this? I don't think it's a big issue, but it's irritating. Thanks!
 

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OK, that's anybodys guess - rev/resonant frequency and heat/expansion related. My first port of call would be the exhaust system & heat shield.
 

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mgf
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My F makes a strange whirring/chirping noise at 1500-1700 rpm. This only happens once the engine has warmed up, after 20 minutes or so. The noise seems to come from somewhere behind my right ear. I took it to the garage, but they "found nothing". I suspect they didn't run the engine for long enough to warm up. Has anyone experienced this? I don't think it's a big issue, but it's irritating. Thanks!

Bizzarly enough, I've had the same thing since I had the alternator belt changed. You only get a whiring noise as you pulling off. It seems to have died down a bit.... still get it slightly.... but it was very noticable after having it first changed.

I'm trying to remember if it quietened down after I had my HG repaired. Do they remove the alternator belt for HG repairs?
 

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It can be too tight with possible damage to the barring in the pullys or alternator, and it would be more likely to snap.
 
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