That is the electric fuel pump that's inside of the fuel tank. That is a common problem with the Chevy trucks. A dirty fuel filter will cause the pump to make that noise or the fuel pump is wearing out.
engine noise coming thru the radio is caused by a bad ground somewhere so instead of chasing that you go to a car stereo shop and buy a noise filter that hooks up to the ground wire coming off the radio.
i was told by a Chevy serviceman that the ticking noise was coming from the fuel injectors firing.but to me it sounded more like lifters tapping or floating.
A loud buzzing noise coming through the speakers in a Mercedes Benz 1994 c280 could be the result of an issue with the ground. You should check that first to see if it fixes the issue.
there is a constant buzzing from fuse box until signal or hazards are activated or until turn signal fuse is pulled
Where is the noise coming from? Under then hood, or interior?
Are the keys in the ignition? If so all you have to do is take them out when you open the door.
cicadas
If it is like a whirring whine that is probably a normal 4X4 noise. Any other noise I'd be looking into as a problem.
it is the blend door in the duct system
Replace door moulding
Wheel bearing? Worn Brake pads?
could be the water pump. maybe radiator