s210 e300td 1998 gurgling noises at switch off

Discussion in 'Engine' started by Triv, Oct 9, 2011.

  1. Triv

    Triv Member

    Messages:
    37
    Joined:
    Mar 20, 2011
    Location:
    Bristol
    Car:
    s210 e300 td 1998
    Hi all, I'm a new member and new to Mercedes-Benz ownership, having been a Volvo man for most of my life but never again after a v70!
    The Merc is fantastic. The interior like new, mechanicals well looked after and the bodyshell like lacework. I have never owned such a rusty car!
    Before I get stuck in, doing the bits and pieces I'd like to, I have a question regarding the (I guess) cooling system. On switch off, I can hear a gurgling noise that goes on for between 1 and 2 minutes. It sounds like something draining away behind the centre console. Does anyone have any experience of this or a hypothesis as to what it could be?
    Thanking you in advance.
    Triv
     
  2. GordonTarling

    GordonTarling MB Enthusiast

    Messages:
    1,678
    Joined:
    Jun 29, 2004
    Location:
    Grantham
    Car:
    2007 E63 AMG V8 Estate
    Could be an airlock somewhere in the heating system, or there are some models which have a coolant pump that runs for a while after shut down - don't know if yours has got this or not.
     
    1 person likes this.
  3. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    It has a coolant circulation pump, but no over-run on switch off.

    Try bleeding the system by allowing it to idle with the header tank cap off for a while, however, gurgling normally indicates head gasket problems.
    Look for bubbles in the header tank.
     
    1 person likes this.
  4. OP
    OP
    Triv

    Triv Member

    Messages:
    37
    Joined:
    Mar 20, 2011
    Location:
    Bristol
    Car:
    s210 e300 td 1998
    Ok, I've had a chance to play with it for a while.
    The gurgling sound is definitely bubbles rising through fluid. I guess in the heater matrix in the dash. If I turn the climate controls up to maximum heat, there is no sound at switch of but if the climate controls are turned down halfway or lower, the sound is there.
    I tried running the engine for a while with the cap off the header tank but it made no difference. I can't see any bubbles in the header tank either.
    So, airlock in the heater? Any ideas?
     

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