Just bought my 07 Colorado a few weeks ago and the fan seems much louder then it should on fan settings 2,3 or 4. This is for both A/C and Heat. I'm 31 and have owned/driven many cars throughout my life and this is the first time i've ever noticed something like this. So is it just me? Does anyone else have this promblem?
Mine got really squeaky and i came close to buying a new one. I decided to try greasing the bearings as a last resort before dropping the $^60.00 and it worked very well. The fan is located under the glove box and held in by 3 screws. Remove each and connector to the resistor. Add a libral amount and itll make a good difference. As Jimsc said, these are a loud howl though.