can anyone help, looking from the front of my 2007 nav d40 i have a strange whistling noise / air noise like a baloon coming from the engine. I can't pinpoint it and I am losing some coolant.
has anyone any idea what it could be
Can you upload a video of the noise?
What conditions does it make the noise under (at idle, driving, under load etc etc)?
Does it change with revs?
Also, try giving the brakes a few pumps quickly, does the noise change when you do this?