It seems to becoming from the front of the engine but is very difficult to pin point. The serpentine belt looks pretty new and I put some belt dressing on there and it had no affect. Noise goes away once the Jeep is wrong so it is very confusing on the source. I did notice that the Jeep has used a lot of power steering fluid so im leaning towards something related to that to be the source.
NEVER NEVER USE BELT DRESSING. It's sticky and attracts grit that destroys your pulleys. Screeching is almost always caused by a worn belt tensioner. Read these posts
http://ricksfreeautorepairadvice.com/diagnose-a-belt-tensioner/
http://ricksfreeautorepairadvice.com/diagnose-belt-noise/
Diagnose belt noise Ricks Free Auto Repair Advice
If you have belt chirp or belt...
SOURCE: 97 jeep wrangler 2.5 running lean
check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings
SOURCE: 2002 jeep liberty siren whining noise on start up
I had the same problem at about the same mileage. Replaced the power steering pump and the start up screaming went away! ( The Jeep's and mine!)
SOURCE: 2004 Jeep Liberty Power Steering Quit Working
I would check for leaks. After the car sits overnight look undernieth the cor on the drivers side. You are most likely going to see a tiny puddle of very thin oil. Check the tubing connections at the pump (mounted to the engine on the drivers side) and the front axel. Be certain to use Mopar power steering fluid when topping off. You may also need to get any air out of the system. Jack up the car so that both wheels are off the ground. With the engine turned off, turn the wheels to left and right lock positions a couple times. Lower the car, top off the fluid if necessary & give it a drive. Hope that works for ya.
SOURCE: Loud squealing sound in my engine
Try removing the belt and turning each pulley by hand. If everything is smooth and free, with the belt still off, drive down the block once and see if the noise is there (this will eliminate all rotating accessories on the front). If you hear the noise, then there is a problem deeper inside. Oil pressure is good? Dont' forget when doing this, you will have no power steering, so be careful.
SOURCE: 2002 Jeep Grand Cherokee leaking coolant and power steering fluid
Just a heads up, $10 bucks will buy you a seal kit for the P.S. pump. I topped mine off for a couple months, then the oring on the high pressure line (from pump, front center) blew and dumped the reservoir in a matter of miles.
The line can be a stinker to get off, recommend driving the car for a few minutes to heat up the pump a little. Don't forget the 20MM wrench.
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