When I would turn the air to "4" my dash would shake violently and was very loud, then it would start to do it on 3 and 2. I found that I had the heater fan was filled with leaves. Which I was lucky and did not have to take out the evaporator, just undid 3 screws, and played with the fan until it came out. Now, on 4 it is very quiet.
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Welcome! (since you're new) Nice job, thanks for posting. Someone with an unbalanced blower will appreciate it.

I've even heard of mice getting in there & building a nest.

 

Quote:

ORIGINAL: JimBlake
Welcome! (since you're new) Nice job, thanks for posting. Someone with an unbalanced blower will appreciate it.
I've ever heard of mice getting in there & building a nest.

That can not be pretty....

 

see it a lot here in AZ ( pac-rats) .. In 1 occasion there were 3 baby mice in the blower motor still alive .