I found what created the whir. It's the device situated between the 1st and 2nd fuel injectors; it appears to have a vacuum line connected to the bottom. Not sure of its function. If I leave fuse 15 plugged in, when I turn off the engine, these instrument panel lights stay on: low fuel, bulb out, ba...

I have a similar drain on my '95 850 (non-turbo). I pulled fuse 5 (30a, blower speed 4) and the drain ceased, but when I re-plugged the fuse, I heard a short whirring sound in the area of the compressor/power steering pump. I only have the 4th speed on my AC because I need a new resistor for speeds ...