I have a feeling that I'm about to describe a symptom that has already been covered here before, but I can't seem to find the right search word to get a hit in the archives.

I just returned from about 20 miles on the freeway at 65-75 mph. Right after shutting the car down I heard a high pitched whistle that gradually increased in pitch until finally fading out. While still hearing the sound, I pushed down the drivers side lock, thinking that it might be vacuum related but no change in the sound. I started it back up and then shut it down again and didn't hear the whistle again. Didn't sound like the antenna motor(?), don't remember if the climate control was on at the time (but was running most of the trip home). HMMMMMM

1979 300D

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1979 300D 275K