Maybe I’m just overlooking it and it’s something simple.
As of a few days ago I can start mainly in neutral and sometimes park so I’m pretty sure my nss needs replaced or clean. I don’t think this has anything to do with this new noise though.
1997 Jeep xj 4.0 aw4

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I just built mine and had a very weird noise out of compressor area, after initial ride it got louder to a point , that opened a hood.
Guess what , it was loose bolts on fan.
always something left

 

ill have to check that out, any other suggestions while I’m in there lol

 

It’s a lot easier to hunt these things down with a mechanics stethoscope. Cheap and effective.

 

Pull the belt and see if it's an accessory. If it's underneath in the bell housing check the flex plate bolts.

 

thats what I plan on doing first thing in the morning. When one thing happens everything happens. My window must have fallen off the track while rolling it down this morning before work in 35 degrees cold weather so I took the other car to work lol. So now I get to fix the window and the noise. Yay!