andys89 said:Does that mean I have to always drive on the motorway with my windows slightly down? Is there any fix to the problem? Thanks
Yep, that's the fix. Just leave a crack in those windows. :wink: No, just trying to diagnose the issue. It's mostly likely a side window that needs adjusting. You can sometimes cure the whistling issue by rejuvenating the rubber seals around the window. There are several products that will do that. The old standard was BMW's Gummi Phlege (so not sure of spelling).
Good luck sorting it out.
Salty
Or left foot!!! :roll: