Screeching noise under car

[Neo1967]

The other day when I started the car it made this weird screeching noise and continues to do so but only on cold start when left overnight
It started about a day ago and would also make this rattling sound which I believe is coming from the exhaust. I have a AWE aftermarket exhaust on it which I have had for 3 years now and It never made this rattling noise let alone this screeching noise
could someone tell me what to look for and what they think the problem is?


https://www.dropbox.com/scl/fi/m2of...3501.MOV?rlkey=z3lwuu7330zsu7lyk5830cdnr&dl=0

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[Neo1967]

https://www.dropbox.com/scl/fi/ogtf...3511.MOV?rlkey=y97mu2wivmpxfp5xbb0hq0nrl&dl=0


Anyone have any idea as to what that noise is?

 

[lucky phil]

The other day when I started the car it made this weird screeching noise and continues to do so but only on cold start when left overnight
It started about a day ago and would also make this rattling sound which I believe is coming from the exhaust. I have a AWE aftermarket exhaust on it which I have had for 3 years now and It never made this rattling noise let alone this screeching noise
could someone tell me what to look for and what they think the problem is?


https://www.dropbox.com/scl/fi/m2of...3501.MOV?rlkey=z3lwuu7330zsu7lyk5830cdnr&dl=0

Serpentine belt possibly. I've had these and V belts make some very strange noises first drive of the day in cold temps. If I suspect a noise is coming from a Serpentine or V belt I give it a quick spray on the drive side with some WD40 and see if the noise goes away. Not approved of course but I don't flood it with WD40 just a light spray with the engine idling to see if it has an effect on the noise. It wont cause slippage. Some belt grip would probably be better or some silicon spray maybe but WD40 has always worked for me.

Phil

 

[BigRon]

Or could be a pulley from the serpentine belt.
But you said from under the car, if it’s from the serpentine belt you should hear it more detailed with the hood open.
Under the car is the drive shaft and the gear box.

The screeching sound is from a moving part

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