Air trapped in the cooling system, try replacing the radiator cap and be sure the reservoir is full to line, it should bleed itself out.
That is the air rushing into the bottle to replace the void left by the water rushing out.
It muffles the sound of exhaust rushing out the pipes
I have a 2000 Grand Am and I have problem with my rear door seal or latch, anyhow the door rattles and you can hear air rushing in. I just deal with it.
stabizer bar links that causing the rattling..
The air rushing away from the electric flow.
I'm guessing it could be the sound of coolant flowing through the heater core. Checking your coolant level and topping it off may quiet the sound.
Ventricular fibrillation
bruit
Mary and the Apostles heard a "rushing mighty wind," according to Acts 2:2.
Palanakonu [pa-la-na-ko-noo] - the rushing (roaoring) sound of the wind
If the sound occurs only when turning, (left or right) the most likely cause is a loose power steering belt. First check to see if the belt is tensioned correctly, or in need of replacement.
A Marmac sound conditioner provides an alternative to background noise. Instead of complete quiet in a room, the person can listen to soothing rushing air.