Sound from right door lock when H3 goes from P to D ...

[Hmmm2]

When I put the H3 into Drive from Park, there is a little vacuum/whine sound that lasts about 3 seconds coming from the right passenger door lock area. It just started about 3 weeks ago. When I took the H3 into the dealer for some other issues last week, the tech typed in something to the effect, "Sound common to A/C compressor." What?! It's not anywheres near the front dash or a/c vents. Has anyone heard this sound in their H3? It definitely comes from the passenger door lock. Thanks.