Think about that some more. It was the "only" way you could buy it
at that moment, in that store. In other words, a total impulse purchase. You still don't know if you need it. You probably don't. MAFs don't really need routine cleaning. It's mostly worn engines that foul them with oil, or using K&N filters with oil.
Anyway back to the A/C. Like
@JHZR2 said,
Don't buy anything. You're still inspecting and evaluating. If the compressor is shot, slapping a belt on will be a total waste of money. An important test is to turn the front plate of the compressor, the part with the rivets and flat springs on it. It needs to be able to move.
It's hard to believe that you've had this many cars and have no clue how to R&R belts. This one is a typical Japanese design like my Honda Civic. Under the direction of a competent mechanic with basic metric hand tools, the idler pulley can be moved to loosen or tighten the belt. It doesn't stretch on. Stretch-on belts are a very recent invention.