When I am driving faster than 50 mph in 4th, or 5th gear, I hear a hissing/humming sound from the direction of the glove box. This is with the A/C, heater, and fan off. What could be the case of this sound, and how would I go about to stop or reduce the sound in question?
My car has 104000 miles.
My car has a manual transmission.
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