Strange noise when idling

[Tywhiteguy]

Just noticed this terrible noise when idling in drive. I’m assuming it has something to do with the pulleys or belts but I don’t have the expertise. It doesn’t happen every time I drive but when it does it’s embarrassing. When I go to neutral it makes no such noise. Here’s the video:
https://youtube.com/shorts/5HPeWBEIgvs

[bumblebee]

We had one similar to this a few months ago on the forum , from memory it was the automatic belt tensioner on the serpentine belt.
It might be a very wise idea to get the car to a decent mechanic asap

[CJVR08]

Yea usually that or fan belt slipping

[bumblebee]

The lancer doesn't have a "fan belt" it has a serpentine belt
The fans are Electronically control via the ECU

[awood]

Maybe a better vid of the engine bay area?
Where the sound is coming from.

[Tywhiteguy]

It’s definitely in the engine bay, that’s the thing it doesn’t happen every day and only in drive so if I’m somewhere where I can safely leave it in drive and put the parking brake on I’ll hop out and get a quick video