Re: Subtle rumble (HVAC) beneath glove comp.
When I start the car in the morning in auto mode, after a few minutes (when the engine warmed and can produce warm air), the climate control increases the ventilator speed to pump more air. Sometimes, the ventilator makes a loud noise like a vibration (different than the normal high speed noise). I just cycle through all manual climate modes and back to auto and it dissapears. It dissapears on its own after the car warms and the climate control reduces the ventilator speed. Try different settings to see if it goes away.