Hi, I am driving Chevy Impala 2003, V 3.4L
For the past couple of weeks I start to get some strange sounds that my car produces at time when I start engine and A/C.

1. Start engine.
Sound appears everyday after 1st engine start and sounds like clicking and light whistling, and disappear after 5-10 minutes of driving. Sound coming from the area where serpent belt located.

2. Start A/C
Sound appears everyday after 1-2 minutes after 1st A/C start , and sounds like horse. Sound coming from the area where air filter located.

If somebody have any idea what these sounds means, please, share your knowledge.

Thanks in advance.