300 SE W126 running too cool!

Discussion in 'Engine' started by LamboV8S, Oct 29, 2011.

  1. LamboV8S

    LamboV8S Member

    Messages:
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    Joined:
    Sep 6, 2011
    Location:
    Ilkley, West Yorks
    Car:
    SE300 w126 & Discovery
    Hi All,
    Not had the car very long and only done a few short trips but noticed the heater is not giving out much heat and temp gauge don't get much above 65 degree! would have thought 90 ? should be nearer norm?

    It had a brand new water pump fitted before I bought it and assume it's got a new thermostat in?
    Could it just need bleeding?

    Cheers

    LamboV8S
     
  2. a lex

    a lex Member

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    Joined:
    Aug 3, 2011
    Car:
    W140 S280
    Or the viscous fan could be knackered?
     
  3. OP
    OP
    LamboV8S

    LamboV8S Member

    Messages:
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    Joined:
    Sep 6, 2011
    Location:
    Ilkley, West Yorks
    Car:
    SE300 w126 & Discovery
    Are they expensive?
     
  4. a lex

    a lex Member

    Messages:
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    Joined:
    Aug 3, 2011
    Car:
    W140 S280
    No idea, sorry - if its only a clutch id imagine not.

    My thinking was if the fan was always running (or running too fast) it would hinder the engine heating up.

    Before tackling that I'd replace the thermostat. Cheap and usually extremely easy to do.
     
  5. grober

    grober MB Master

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    Thermostat stuck open or removed would be my guess. If the viscous fan was permanently on you would hear it. Has it got the correct 50/50 water antifreeze coolant mixture in it?
     
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  6. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

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    Id say thermostat too...
     
  7. OP
    OP
    LamboV8S

    LamboV8S Member

    Messages:
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    Joined:
    Sep 6, 2011
    Location:
    Ilkley, West Yorks
    Car:
    SE300 w126 & Discovery
    I will check the stat & need to check the coolant, is it special stuff?
     
  8. ianrandom

    ianrandom Active Member

    Messages:
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    Location:
    Berks mainly, UK. Devon too a lot of the time.
    Car:
    1986 420SE, 1990 420SEC, 1989 2CV6.
    Only use the correct coolant. Cant remember which colour but the wrong sort causes corrosion.
    +1, thermostat. Cheap and easy, may as well bung a new one in anyway. MB parts only though.
    Unless your viscous fan is stick on constantly. These can cost £400 but dont pay that, about £60 for a good Sachs one at Euro Car Parts. They are meant to disengage as you go up through the revs in gear. If it 'roars' all the way it could be expired. You should hear the fan roar a bit when you first start the car and for a bit until it settles. Then only if the engine is geting hot.
    There is a secondary electric fan too, that only kicks in when it gets hotter, 100ish i think.
    82 degrees is roughly what the thermostat is set to i think, so that'll be your ideal engine temp.
     
  9. OP
    OP
    LamboV8S

    LamboV8S Member

    Messages:
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    Joined:
    Sep 6, 2011
    Location:
    Ilkley, West Yorks
    Car:
    SE300 w126 & Discovery
    Thanks for the advice, will act on it.

    Cheers
    Lambo
     

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