if you look at the top left side of your engine compartment you will see a little unit on the firewall that looks like a round metal bulb thing with 1 small hose going to it and 2 larger coolant hoses going it it. Its the control for the heater in your car. Mine makes a really weird noise that sounds like a hiss when the heat is off, something in the electronics i think i have no idea what it is. Anyways, see if its comming from there, then turn your heater on and see if it still makes the noise, mine stops when the heater is on for some reason.
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