for the last 1-2 weeks, the fan of my cooling system makes a very disturbing/weird sound. i can hear it only when i use the system on level 1 or 2, because higher the air flow makes a louder noise, so i can't hear the fan...but at level 3 or 4 the air jet is too strong...so i am actually using the cooling system only on levels 1 or 2 where i get that crazy sound.

do you know where it comes from and how it could be removed?

thanx alot in advance!

Had the same prob, on the wife's car, it was a quiet ticking sound on fan setting one. When I opened it up, i found the stalk of a leaf. Since that was removed the system has been as norm.
Hope this helps or points you in the right direction.

Tara Ian.