Guys, have been noticing while running the A/C when i come to a stop a hissing sound starts coming from below the passenger dash and gets louder after sitting for awhile, once i start to accelerate it slowly dies back down and goes away. Any insight on what in the world this might be ? The sound is almost like what an empty aerosol can would make.

 

Sounds like a vacuum leak under the dask. Maybe the air management doors are vacuum operated??? I don't own a newer model...