What is this for?

Discussion in 'Engine' started by MercedesEnthusiast, May 3, 2019.

  1. MercedesEnthusiast

    MercedesEnthusiast Member

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    Mercedes W205 2015.

    I've found a bottle which seems to be empty and have no idea what it's for. Last time I've checked all fluids, there was some pink fluid there but now it's completely empty.

    Does anyone know what that is?

    Thanks a lot.
     

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  2. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    I found it, it's the coolant expansion tank but that should be completely empty?
     
  3. renault12ts

    renault12ts MB Club Veteran

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    Don't think so. Check in your manual.
     
  4. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    It doesn't even show in the manual that particular bottle.
     
  5. markjay

    markjay MB Club Veteran

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    I believe this is the Intercooler Circuit Overflow Reservoir.
     
  6. markjay

    markjay MB Club Veteran

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    It is separate from the engine coolant expansion bottle which is located on the opposite side on the engine bay.
     
  7. John N

    John N Hardcore MB Enthusiast

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    What does it do? :dk:
     
  8. markjay

    markjay MB Club Veteran

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    It allows the coolant to expand... the Intercooler has it's own liquid cooling system.
     
    John N likes this.
  9. OP
    OP
    MercedesEnthusiast

    MercedesEnthusiast Member

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    So, should it be empty? O it needs to be filled in as the coolant?
     
    Last edited: May 3, 2019
    John N likes this.
  10. grober

    grober MB Club Veteran

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    Its complicated ! low temperature circuit for OM651 engine in W205. Its pink because of the antifreeze in it see this document page 12
    ftp://91.216.87.74/Poprodaja/Izobra%9Eevanja/Knji%9Enica%20literature%20za%20izobra%9Eevanja/Novi%20C%20(W205)/T0964F%20U%E8benik%20EN.pdf

    level should be covered here - look for a level indicator inside the vessel but caution it may be under pressure when hot
    ps it does look as if you may have lost fluid.
    W205 / M651 / G716 / 09 / 41 - Mercedes-Benz WIS

    [​IMG]
     
    Last edited: May 3, 2019
  11. BMF

    BMF Hardcore MB Enthusiast

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    I'm gonna check my level tomorrow :banana:
     
  12. Gurdit

    Gurdit New Member

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    Did you find out the issue mate? I’m having the exact same issue and at cold the pipes connected around the intercooler circuit reseviour has pressurised hoses,

    Any idea what was the cause of fluid loss?
     
  13. RicardoBessa29

    RicardoBessa29 New Member

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    Good evening good people ... I have the same problem on my c250, and adding water to the cold van starts to fail and just stepping deep into the accelerator is back to normal ... in a workshop they could have cracked the intercooler ouu with some leak ... does anyone have any news on the subject? best regards
     

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