Dial up modem sound from engine!
Over the last few weeks a strange noise started to appear from the engine bay, normally this would go after a few minutes but is now constant. The sound increases and decreases with engine speed and I can only terrible the sound as identical to that of a dialup modem connecting to the internet.
I took the car to my local (trusted) garage and expected them to say it was the aux belt or at least in that area but they said the noise is coming from the engine.
Any ideas or suggestions