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Discussion Starter #1
It's definitely the bearings inside the alternator. Makes a quiet squealing noise when cold for the first 1/4 mile or so then goes away. I have a new alternator to install but before I do, since the alternator itself is charging fine, any way to lubricate it? I didn't think there was since the bearings are sealed but wanted to make sure. Not a big deal but a little embarrassing!
 

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I'm not aware that it can be lubricated. Do you have a stethoscope? It might be the tensioner pulley.

I chased a rumble only when cold during fast idle and thought for sure it was the AC compressor pulley bearing. I didn't have a steth but used a long steel rod and it seemed loudest from the AC. I had an assistant toggle the switch on/off and confirmed it was from the AC. So, I pulled the clutch and pulley, pressed out the old and pressed in a new bearing and...it wasn't the AC pulley. It was the tensioner.
 

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Discussion Starter #3
Yeah I stethoscoped it - it's the alternator. Tensioner pulley is newer too.
 
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