I think I have a leak (need doctor's diagnosis)
 

The car is make a whistling noise that appears to get faster as I accelerate. It sounds like someone is letting air out of a ballon and pinching the end at the same time, its that sound. What I also noticed is that my A/C and Heat smells like complete a$$. It gets better if I dont let it outside air but when I hit that circulation button the whole car reaks of old people. I know its a little stupid to ask online about small problems like these but I figured someone might have had the same thing happen to them. Any clue to what this might be and how urgent it is to fix?

Thanks!