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    W203 - air con hissing when on coldest setting

    As above, noticed the air con making a hissing noise over the past month and it gradually seems to be getting louder. Seems to be coming from centre vents (above the radio) and goes immediately when you switch the fan off / goes gradually when you leave the fan running but switch off A/C. Read...
    • cws196
    • Thread
    • air coldest hissing setting w203
    • Replies: 3
    • Forum: Interior
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