It's just funny how these old cars make the strangest noises. I can hear it too, if someone can try holding it at 2000 rpm and you listen with stethoscope like fixkick says, maybe you'll find it. Just watch those fan blades, they almost caught me the other day. I find it so weird that when you let the gas pedal go and the RPM's just pass by 2000 rmp's you can hear the noise too.
1996 Geo Tracker, CAMI, 16 valve, 5sp, 4x4, soft top, 2 door, no a/c