I have a 2000 Blazer, 4wd, 4 door.
Today I noticed when I turned the fan on to start warming up the truck, there was a loud clicking noise. If I turn the fan off, it goes away. It seems to get faster as I turn up the fan, almost like a card in a bicycle spoke is what it sounds like. The heat is just fine, it's just the fan that makes noise. Any ideas what this is perhaps and what it might cost to fix?

Thanks!

 

Sounds like a piece of paper that got stuck in the fan. It happened to my Audi S4. Thankfully, all I had to do was pull the cabin filter and it was right there in the vanes. I've never had it happen to my Blazer, though...

 

If you live where is it Fall and the leaves are dropping... It is a leaf most likely.
But if it is paper,either wait until the blower motor finally chews it or pull the motor!