When I'm driving my W126, there is a whistling noise that seems like it is coming from the dash...perhaps the defroster vents. I can shut off the HVAC and it's still there. It also seems to flucuate or change with RPM. Not in a linear fashion, but RPM does have an effect on it. It's not terribly loud, but noticible. Any idea what this might be?
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."