In GTA 5 Online, I call my mechanic and the car spawns close to me, but I can't ever see my mechanic. Does someone know why?
Well, I had a long post of speculation, but then there's the wiki entry:
As of Title Update 1.10, the Mechanic will no longer deliver the player's car. This is possibly due to the Mechanic's tendency to crash or otherwise damage the player's vehicles while delivering them, because of AI glitches. It could also be due to the fact that the Mechanic tends to drive away when there is a fight going on. Instead, after the update, if the player asks for a car to be delivered, it will immediately spawn near him.