Join Date: Oct 2007
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Had mine done at 60k, then at 85k when the water pump was replaced I had them go a head and replace it as well but kept the old belt as a spare. If that's the original belt regardless of mileage, age and cracking can put a lot of stress on a belt, plus summer time when you are running the AC, that adds even more stress to the belt, I'd replace the belt and be done with it. I'd rather replace it before it breaks than have it break when you are in the middle of nowhere....or pickup a spare and just keep it with you in case it does break.
Usually when the fan clutch fails you start seeing oil on it but usually its covered in dirt as all the dirt will stick to the oil as its leaking out of the clutch. When they fail they usually won't work at all, as you'll notice the truck running hotter, or it will be locked all the time and sound like a jet engine, they usually don't make any squealing noises. The should have a bit of resistance to them if you spin the fan by hand.