Hello, I have a 2002 v6 mustang standard tranny. It seems that when the engine warms up fully, there is a little bit of engine noise noticable from inside the car. It's only noticable when the engine is idle. It sounds like a constant whine kind of sound, but it's not high-pitched. When i rev the engine, it seems to go away. When I turn on the heat - the noise seems to be amplified significantly inside the car. I checked under the hood while this happens, and I really can't notice it at all.
I thought that it might be the crappy electric cooling fan - as the fan comes on when you turn the heat on (usually).
Please any help or advice would be greatly appreciated!!