R129SL Water Temperature - Is This Correct?

Discussion in 'Engine' started by CharlesdeGaulle, Jan 17, 2015.

  1. CharlesdeGaulle

    CharlesdeGaulle Member

    Messages:
    52
    Joined:
    Mar 28, 2013
    Location:
    Gloucestershire
    Car:
    124 Cabriolet - 320 CE; 1973 350 SLC
    I have a 91 500SL. The water temp gauge sits at 60 when the car is warm and up and running. Is that normal? I realise that the ambient temperature is low at the moment, but I wondered if that seems a little low? If it is, what should I be looking at?

    Any thoughts? Thanks in anticipation.
     
  2. Stratman

    Stratman Hardcore MB Enthusiast

    Messages:
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    Joined:
    Jun 15, 2003
    Location:
    Sunbury
    Car:
    W203 C200 CDI '04Estate
    That's much too low.

    New thermostat time.
     
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  3. OP
    OP
    CharlesdeGaulle

    CharlesdeGaulle Member

    Messages:
    52
    Joined:
    Mar 28, 2013
    Location:
    Gloucestershire
    Car:
    124 Cabriolet - 320 CE; 1973 350 SLC
    Thanks Stratman. Would there be any other symptoms arising from a faulty thermostat?
     
  4. Stratman

    Stratman Hardcore MB Enthusiast

    Messages:
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    Location:
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    Car:
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    The heater will be fairly anaemic and the fuel consumption will be higher than it should be.
     
  5. OP
    OP
    CharlesdeGaulle

    CharlesdeGaulle Member

    Messages:
    52
    Joined:
    Mar 28, 2013
    Location:
    Gloucestershire
    Car:
    124 Cabriolet - 320 CE; 1973 350 SLC
    That very much sounds right. New thermostat it is! Many thanks.
     
  6. BTB 500

    BTB 500 MB Club Veteran

    Messages:
    18,440
    Joined:
    Aug 7, 2005
    Location:
    Berkshire
    Car:
    R129 SL500, W639 Vito 120, S203 C230
    Yup sounds like thermostat failed open. You can tell with the bonnet open ... the radiator top hose will start to get warm soon after starting the engine. It should stay cold till the engine is fully up to temperature.
     

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