Ok so recently had my engine replaced and prior to the engine being replaced I had this same problem. When driving the XJ around for a full day my temp gauge just passes the 210 marker and my fans kick on to cool the engine. When this happens the jeep shakes and is really loud. I opened the hood and I applied some weight to where the fans and radiator are and it reduced the noise but not by much. Is there something loose that I need to tighten. Please help.

Check to see if your electric fan is not cracked. I just put one in from a junk yard and it's doing this same thing. I put JB weld on it tonight to see if it would stop the vibrations. Check out your efan blades for cracks.

On my way home it started doing it again and i noticed that I am missing a piece of my electric fan. Is that what is causing all the nose and vibration. Why would that cause so much nose and vibration

the fan is out of balance

Any how too's on changing a electric fan

Any type of how too's

unplug it, take the two screws out of the top front of it (if you still have them) and pull it strait up, just replace it with a stock 96+ one if you can from the junkyard

Nothing to it. You can change the part out in about 10 minutes. Unplug one connector and remove to screws. Drop the new one in, put in 2 screws, attach your connector. Done.

Yep, replace the electric fan. Mine does the same thing.