Hey, I have a 91 Rodeo, V6, 210,000 miles and just now experiencing problems w/the fan. Whenever I turn it on the fan sounds really loud... it still blows air, but wondering where I would start troubleshooting. If anyone can offer any suggestions, would greatly appreciate it as I prefer to do the maintenance myself. She's old, she's got rust... but she's paid for! Thanks!

 

What kind of sound is it making?? Can be a bearing, can be a bent blade, can be something in the blades path, can be a worn belt, could be something near the fan, but I would think belt or bearing for this case.