[MovedGoalPosts]

Once upon a time we called it a fan belt as the belt connected between a pulley on the engine, providing the source of the belt moving, and then wound round the alternator and the radiator cooling fan at the same time. Most modern cars, both in the name of efficiency, and to make the engineering easier with engines now orientated sideways rather than front to back (more passenger space in same car length), have an electric fan to cool the radiator, which is used only when cooling is needed, so keeping the engine at a more constant temperature. Thus today's cars frequently cannot have a fan belt, as it does not connect a fan, all it connects is the engine and alternator. Note if you had no alternator (which usually mounts alongside the engine) the battery wouldn't get recharged.

If the belt is a little bit slack, or worn, then the squealing sound, will occur. tightening it is relatively simple, The alternator usually has one point secured with a bolt through a slightly curved slot, Loosen the bolt, rotate the alternator slightly so the belt has more tension, and retighten. Replacing the belt can be done the same way.

For a garage mechanic, it's a five minute job, so don't let them claim otherwise.