Sounds like it is internal.
Could it be your water pump impeller?
Check all your belts also,especially the timing belt. A belt could be starting to disintegrate.
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- 19 Nov 2019, 01:50
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Re: 1993 Volvo 240 wagon roaring sound from rear
Maybe the linings on the emergency brake shoes sticking within the hubs of the rear brake rotors. The linings can dislodge from the shoes completely.