So I noticed a ticking noise while my 2004 Blazer was running. After opening up the hood I saw that the fan was wobbling and was clicking against something. I turned the truck off and grabbed the fan to see if there was any play but there is none. I have no overheating issues or anything. Any idea what it could be?

 

Sounds like the fan clutch is actually bent

 

It is imperative that you fix the issue before you run the engine again. If it should come loose it could destroy a lot of other parts on the front of your engine. Seen it happen before. And whatever you do, don't start the engine to try and reproduce the problem. If it comes apart while you're examining it you could be seriously injured or worse.
Safety first.

 

Had an 82 Monte Carlo I yanked the dead V6 from and dropped a built 350 into years ago. Grabbed a fan clutch I had sitting around in the garage and threw it on just to get the car rolling, didn't realize it was bent. First time I pushed the motor to 5000ish RPM's screwing around, it vibrated so hard it busted the water pump bolts loose from the front of the block... that was fun...

Yes, replace it ASAP...

 

Turns out it's the water pump. I picked one up this evening and will be replacing it tomorrow morning.

 

that makes since too


odd though; curious how it bent the shaft