Hello,
Had this chirp on cold for pretty much ever. The old AUX tensioner shock had spat it's innards out, so assumed it was that.
The chirp has stayed on constantly recently, so I changed the tensioner. No change. I then looked into the alternator pulley, that seems ok, it doesn't seem to flap about like other videos I've seen.
Also the noise is alot louder / clearer nearer the crankshaft pulley :/.
I noticed my coolant was on minimum. This isn't unusual as I have a known leak fixed with rad weld (yes I know), but that got me thinking if it could be the water pump leaking onto a pulley / bearing that could cause this?
I can't seem to find any other videos with the same noise, if you make it to the end, you can see it's louder when directed at the crankshaft.
https://youtu.be/1pWJ09iTzCE
Please note, the car is on 233k miles. Haven't the foggiest when the timing belt or water pump was last changed.
Aux belt changed about 3 years ago. Aux tensioner 2 days ago.