I went digging through my car a little just to see what there is too it. I checked this sound out when the car is off. The sound appears to be coming form the attached picture. Seems to be where the hoses for the heater core go. Please let me know if more explanation of the picture is needed. Also, this flap here doesn't seem to function, although the passenger flap does. Would this possibly be making the sound? What makes this open and close?

One more thing, just to clarify, the chirping and the wee-oh are not related, and the wee-oh is not too loud or screetching, more like an electrical/motor hum/issue. Hard to explain, sorry.

Thanks,

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1983 300SD