whistling

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stevend

Member
Joined
Aug 11, 2006
Messages
45
Location
somerset
Car
c 270 cdi, CLK 230k I miss this car but not as much as I miss my E 320 coupe.... and now an ML
On my w208 230k clk a whistle has started which seems to coming from the air vents. It only does it with the aircon on and when coasting, if I accelerate it goes away. Its very high pitched and is currently driving me mad. As it happens when coasting I'm thinking vacuum, is there a vacuum pipe connected to the aircon or heater controls. Is there anything else it could be?
thanks
steve
 
Something stuck in vents try closing the vents individually try n locate whistle ? but not sure about vacuum pipes maybe others might know?
 

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