did a fairly long trip last night (around 200miles) and right as I got close to my house (last mile or so) my car started making this strangle noise. very loud inside the cabin, not so loud outside and i dont think it's coming from the engine bay (but it was too cold to open and check). if it was, it sounded like from near the rear of the bay/behind the center of the dash.
basically the frequency was about every 2 seconds for about 2 seconds, a kind of 'whine/moan/howl', somewhat like when a big rig is slowing down and it makes that 'moaning' noise.

any ideas?

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys