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squeaks can be the water pump or the power steering pump bearing. as for 2000 rpms to 4000 rpms. could be a loose wire on the cam or crank sensor. or a blocked breather line. would check ecu for fault codes... ( even if no engine light is on it will still store codes) egr fault you would know when that goes. your fuel go through the roof. and other things.
My guess is a pully is going bad on the tensioner. The new belt had more grip so it was able to force the bad pully to turn but now that the new belt is a bit worn it's beginning to slide as the pully gets worse...Does tha make sense? Solution: Remove the belt and turn each pully by hand. The pully's should turn very easily without ANY struggle. If you find a pully that has any stiffness ...(Or is hard to turn).....thats the bad one. Replace the bad pully and you will be a happy camper
Make sure your alternator and power steering pumps are turning freely. I personally have never seen a power steering pump lock up, but it could. I have, on the other hand seen numerous alternators freeze up because of bad bearings. Either one would cause a "squalling" sound as the engine runs and tries to rotate the belt over a pulley that isn't turning.
Take the belt off check the clutch fan and spin all the pullies insure they spin freely and do not wobble if any do replace them if all checks out ok put a new belt on. make sure the belt tension is not to tight should have about 3/4 inch play.
First off, how many miles do you have on this engine?Since you changed the belt and still have the noise,you have one of your pulleys making this noise.Usually it's the ideler tensioner pully.Take the belts off.Turn the pulleys by hand including the alternator pulley.if you hear the slightest faint noise there's your problem.repalce the part or the pulley. A lot of times the alternator pulley does this,the front bearing or the rear bearing as well will make these nasty squeals.Find an auto electric shop that rebuilds alternators and have them replace the bearing for you,while your at it service your unit,it will save you in the long run.
I would bet that there is a pully on one of the accessories that is about to stop turning. I would remove the belt and make sure that all of the acc. turn with out to much effort. I.E. altnator the tenstioner, as well as the a/c and idler pullys.
Is it a squeak or a howell thats the real question here because it could be the oil trap which is about $140 and is attached to the bottom of the filter housing not to hard to do if you have worked on this type of car befor. And has the car died yet.