Bearings could be bad, you can always losen the belt and check for play in the pully, if there is play in the water pump pulley, usually the water pump is bad.
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If it's the sound I'm thinking of you might just need a new belt or a pully. Typically water pump going out sounds like you have a turbo winding up and steering will growl.
I can't say for sure but it could be the tensioner pully. I don't think you should be able to move it side to side. That would indicate that the bearing is worn.
I'd check the water pump, probably bearings are going out and the seal is going out.. Is it making noise? You can slip the serpintine belt off the water pump pulley working with the idler tension as you do so. Once it's free move it around (the pulley) check it for "slopping" you know "slop". Good luck
COULD BE A BAD BEARING IN THE IDLER PULLY OR THE TENSIONER ON THE TIMING BELT OR THE SERPENTINE BELT. IF ITS A SQUEEL IT MAY BE SOME COOLANT GOT ON THE SERPENTINE BELT. TRY TO WASH THE BELT WITH WATER AND LET DRY COMPLETELY. IF NOISE REMAINS RETURN TO THE SHOP THAT DID THE WORK.
If the fan is attached to it than it is the water pump making the noise and it will need to be replaced. If the fan clutch is not attached to it than it is either the idler pulley or the tensioner pulley. The tensioner is on the passenger side (left) of the front of the motor.
Could be several things. WHICH ENGINE?.. 4 cylinder (has three belts, power steering/water pump, alternator & A/C compressor, one tensioner pully A/C compressor), The V6 2.7 (has only one belt, 1 Idler pully and 1 tensioner pully), the V6 3.5 has two belts - A/C/alternator, and power steering - there are two tensioner pullys). Noises can be caused by the belt(s) themselves, pullys, bearings, pully bearings, water pump shaft bearings (or belts/pullys rubbing up against something). Let's not forget that there is also belt(s) behind the Timing Belt cover as well as pullys and bearings associated with the timing system. You could start by removing one accy drive belt at a time (alternator, water pump, compressor, power steering, etc) to see whether or not the noise goes away in each case. If after each case, you discover the noise is still there, it's probably behind the timing belt cover (idler/tensioner pully, water pump shaft bearing, crankshaft bearing, etc.). Good Luck
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