i changed my cabin air filter, and check the engine air filter, I am getting a mildew smell coming through the blower when its on fresh air. I am going to try to take air air cleaner hose and blow it out, but i dont know where the smell is coming from?

 

Air cleaner hose ? Engine air filter has nothing to do with AC or cabin air. 2 separate systems.

The smell is most likely coming from the AC duct system under the dash. Left over condensated air or moisture that sits in the ducts can produce mildew.

 

See this thread below....

https://www.chevyhhr.net/forums/prob...ls-here-50627/