Dear Brent, as with many old fridges and freezers you are like to have a bar fan on the back. pull your fridge out from the wall and with a screw driver handy, keep removing panels (only ones you feel you can put back properly) untill you can see the bar fan. (It look like the blades of an old lawnmower) remove all the screws etc untill the fan is held on by only cables. If you take off the cover that surrounds it, you may well find a lot of solid cr*p down there that is rubbing against the fan and causing clicks. (biro's and small spoons are an extremely common one) if there is nothing there give it a clean and a tighten and then put evrything back. dont go any further because you will start making things worse! good luck
Jack
February 2008