I'm getting an intermittent hissing noise coming from behind the passenger dash area. I think it's related to the A/C cycling. I don't remember hearing this before, but now that the temperatures are over 100 here, it seems to be more prevalent. I've pushed the ECO button when I hear the hiss, but it doesn't stop right away.
The noise sounds like some kind gas moving at high speed through a metal pipe - kind of like the hissing noise you would hear on old style home radiators. Has anyone else experienced this? The A/C, by the way, is still ice cold.