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Hello, with my 2000 W220 Mercedes s280 started to make a funny noise from the aircon/heating system,
The last couple of days the noise sounds like an air raid siren!It is not extremly loud but a noticible noise.
When I put it in Economy mode (no cooling) the noise stops, I do have to turn off the heater then press the on button again with it in economy mode for the noise to stop, then when I press the economy mode off the noise will start up again right away, so I presume it is something to do with the aircon... I can't pinpoint where the noise is coming from in the engine bay.

Since I have had the car I have not used the economy mode until now!

Any suggestions would be really appreciatied :)

Thank you
Ron
 
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