Need diagram for serpentine belt BMW x3 3.0SI 2007 May have electric water pump

SOURCE: Crankshaft pulley Nissan Pulsar '91 N14

Hi your alternator pulley is hold by a nut about twenty mm, chech it it may be lose......good luck

SOURCE: squeeling belt

Pour a little water on it!

SOURCE: 1998 Jeep Grand Cherokee Power Steering Pump/Pulley/Belt

I see this is a two part question...
In replacing the alternator, there is no reason at all to be messing with the pulley on the power steering. That pulley is pressed on and though you could remove it with a puller it is far more difficult to re-install without the proper tools. (it is not hammered on). Power steering pulleys don't just fall off. They are so tightly pressed onto the shaft that they don't even require a retaining bolt to hold them on.
Without the benefit of being able to examine it myself, I'd have to guess that either you originally had a mis-match of pulley to pulley shaft and the pulley was sliding on the shaft (so remote a concept that you may be hit by a meteorite if you buy that) Or someone removed it for an unknown reason and did not properly re-install it.

Testimonial: "Thank you thundergod! My daughter has been borrowing my car so I have not been able to examine it myself either. Thanks again for your quick help!"

SOURCE: NEED THE BELT ROUTING DIAGRAM

1. a/c comp to water pump.
2. alt to p/s pump.
3. water pump, crankshaft, p/s pump.
4. water pump, crankshaft, idler. ------------- crank pulleys have 3 grooves, the third one is for AC.-------- Click this link to view the diagram for routing the belt:--- http://technoanswers.blogspot.com/2011/07/belt-routing-diagram-for-corvette.html ----------- This should help.Thanks.Helpmech.

SOURCE: putting belt back on pulleys

Your owners manual/label in engine compartment will have a diagram for how the belt runs. There will be one pulley that has a spring tensioner. This pulley keeps the belt tight and is used to install the new belt. Depending on the vehicle, these can be easy or very difficult to get at. The pulley or arm attached to the pulley will have a square hole of some means of inserting a tool to allow you to release the spring tension. I typically will install the tool and verify that I can get the tension off the belt before starting the process. Once I feel comfortable that I have the correct tool, I will release the tension and remove the belt. Then reinstall the new belt per the diagram. You will have to keep the tension off until the belt is in possition. I have found out that it is easiest if you put the belt on all the lower pulleys first and get down to one remaining pulley (top side of the engine so you have good access). Now use the tool inserted into the spring tensioner and move it until you have enough slack to get the belt over the last pulley, once in place release the tensioner. I typically have the belt over the tensioner pulley, and use the alternator or steering pulley as last pulley because it keeps your fingers out of the pinch points. There are some special tools you can purchase at Sears to assist, but I typically use a ratchet or wrench for this work. Sometimes a third hand helps out.