1997 making a funny noise

i was wondering if anyone could help me??? yesterday my truck started making a noise. This noise is comming from under the center console ( the divider between the driver and passenger seats). it happens after ive been drivin for a little while and even when im parked. it sounds like a clicking or something is suppose to be spinning but isnt. The truck has 83,000 miles and hasnt givin me any other problems..

if anyone has an idea can u pleeeesssse help

Does it make the noise when the engine is not running?

no only when the engine is running. when i first turn it on i dont hear anything but after bout 20mins ill start to hear it then it will stop for a few mins and then start up a again. it just started yest

Is it a tinny/buzzy noise? Does it change with engine RPM?
When the insides of my '97 catalytic converter started coming apart, it made noises.
While under the car, I could hit the cat. converter with my hand and it made the same noise but shorter duration. I replaced it.

On the '92, the heat shield on the catayltic converter loosened and made a similiar noise...I tightened it.

no its not the converter i no the sound of the shield when its loose. if i place my hand on the floor board ( middle console right under the ash tray ) i can feel a knocking. im on my way to my mech to see what he says

Aside from a bad motor mount, loose bolts on the torque converter or even loose bolts holding the transmission to the back of the engine, your guess is as good as mine. I believe you're correct to run it by your mechanic.