Aaron, can you tell where exactly the squealing is coming from? If it's a belt slipping on a pulley, I'd see if the belt is just worn/stretched and due for a replacement. If the belt looks good, then I'd check whatever pulley is squealing, as it's possible that the bearings in that component are shot and making it hard for the pulley to spin? Perhaps also there's too much slack in one of the belts, and it can be adjusted for?
I use this stuff on squealing belts (when the belt slipping in the pulley but everything else checks out ok) and it works pretty well:
And yes, the timing belt is "internal" to the engine, it's behind a cover on the front of the motor; you can't see it under the hood.
A good tip for narrowing down which component is squealing, grinding, rubbing, etc: Take a wooden dowel, or a narrow strip of wood off of a board (I like to use something about 1" round/square and no shorter than 1 foot) and (
carefully) put one end of it to the suspect component (the body of the alternator, the body of the AC compressor, etc.) and put your ear to the other end; with the engine idling. The wood acts like a stethoscope and lets you hear "past" the noise of the engine.
