hi all. I've noticed a humming noise from my car over the past few weeks. the noise is present whenever the engine is running and is more obvious after a journey. the noise is there, when the car is stationary, and if the clutch is pressed down or not. if i slowly press the rear window heater, or try to raise the windows when they are already raised.then the noise becomes deeper and louder. when i stop pressing them the noise goes away. when the indicators are on, the noise level fluctuates in time to the blinking of indicators.
has anyone heard this problem before? I'm thinking the problem is with the alternator. although i have no problems with starting. thanks for any help.