The noise comes and goes, but now often I can hear it.
Where does it come from? Here are some info that could help:
1) It usually hum when it's cold 2) It hums when the car is standing still (transmission in drive, but I brake to stop). 3) The humming noise changes a bit (louder/softer) when I turn the steering a little. Usually, from straight steering, if I turn over, the noise get louder, even though the car is not even moving (engine runs, transmission in drive, but brake on).I originally thought it's the the belt. However, I don't see the connect between the belt and the steering wheel. I thought it maybe the transmission (something in there), but put to park and the noise is still there. One day, I heard a quick hissing noise, and then the humming when away. I originally thought it's so bad that I have to have it fixed, then when the noise go away, I thought maybe something stuck and now released. However, this noise came back.
So, if not the belt, it can also be the gas pump. I had a car with noise, then the pump went bad. However, I still don't know how the steering has something to do with this.
So, could it be the steering pump (is there such a thing?), like the oil pump for the steering?
I don't know. What do you think?