Time to replace blower motor?

[raptorforme93]

The other day the blower motor on my hoe was making a loud clicking noise when I started it up. The air was set on low when it was making the noise so I turned it on high to see what it would do and it started making a high pitched click for 2 seconds and then it disappeared and havent heard it since. Now (and sometimes before) the motor makes a light but audible noise when the air is on and I was wondering if you guys think its time to replace it. I was also wondering how hard it is to replace? Thank you!

 

[SunlitComet]

The clicking was probably a leaf or twig debris. The noise with air condition is probably just the freon movement. Until it really gets out of hands or starts clicking I would not even remove it for inspection but if you want I have plan:
http://www.sunlitcomet.com/pdf/automotive/tahoe/96-97/1996-Tahoe-Blower-Motor-Replacement.pdf

 

[raptorforme93]

Im sorry I didnt clarify very well, all of the noise is from the blower motor. Im sorry if I made it sound like there was air conditioner noise. Do you think that a twig or something got stuck and the blades were hitting it and then it broke free and the noise went away? That would definitely make sense. There really isnt anything in a failing blower motor that could make that noise is there?