I have an 01 tj and recently a whining noise started to come from somewhere under the hood.
I looked on here to see if anyone else had the same problem but all the threads were about whining noises when turning or coming from a wheel.
My noise is not from one of those, I can here it when the car is on but parked.
When I first start up from cold, going to school in the morning, there is no noise. But by the time I get there you can here it. It sounds like its coming from the back left part of the engine(if you were sitting in the car listening). Pretty much right behind the steering wheel but in the engine compartment.
Any idea what this could be?