If the mechanic only "thought" it was the alternator bearing, it doesn't sound like much of an inspection. Then if that don't fix it, it will only be another 1500 bucks for the a/c. Unless you have your stethoscope handy, you will have to improvise. Get a long, preferrably hollow, small diameter tube/pipe or I've used a wratchet extension in a pinch. Without getting it caught in the fan or the belt, put one end on the non moving shaft of the bearing you want to check and put your ear to the other end and listen. The bad bearing will be magnified and obvious.
The stethoscope or a home made one also works good for checking valves, water pumps, and isolating other noises on the engine.
The diagram for the belt will be on a label under the hood somewhere.
Don't know about yours, but some alternator removals require removal of shrouds, the a/c, other belts, air cleaners, and you name it, and sometimes from the top or underneath. Sometimes takes special tools and pencil length fingers and pencil thin fingers, and paper thin hands to get at certain bolts and the alternator. Murphys rule is that the bolts will be harder to get off than they were put on. May need a breaker bar or cheater pipe. Probably need a swivel socket to get on one and then there will only be room for a half inch of wrench/wratchet travel so it will take a half hour to remove or loosen a bolt. The wire quick connectors will be stuck and likely pull a wire loose or break the connector getting it apart. You can never find the tab on the wire connector and figure out if you squeeze it or lift up on the tab to pull them apart. It will probably take you 3 or 4 times longer than the gm mechanic.
Then you may find out that the belt was a little loose and just needed tightening or maybe a little belt spray on it. Give the squeeky bearing a few shots of spray silicone on both sides to see if it helps it temporarily.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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