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Thermostat, temp & fan running on

Discussion in 'General Mercedes-Benz Related Discussion' started by clarkey2311, Feb 13, 2018.

  1. clarkey2311

    clarkey2311 Active Member

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    Your Mercedes:
    C350 CDI - 2011
    Hi guys,
    I’ve noticed since I bought the car that it’s only getting a reading of between 40/60 on the temp gauge when driving to work.. 15 min trip, some morning it’s get to between 40 & 60 then goes back down ... on the odd occasion it’s gone completely back to 40 when I arrive at work and the fan is blowing for around 30 seconds or so when I turn the engine off ... is this due the weather at the minute ? I’m used to cars getting to temp in like 5 mins and then staying there constantly so this is a tad strange for me :confused:
    It’s a 2011 C350 CDI by the way
     
  2. LostKiwi

    LostKiwi Senior Member

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    Location:
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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Sounds like your thermostat is foobared.
    If you have a DPF get the thermostat fixed ASAP as it will fail to regen if the engine is not up to temperature.
     
  3. OP
    clarkey2311

    clarkey2311 Active Member

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    Your Mercedes:
    C350 CDI - 2011
    How do I know if I have a DPF or not on my model ?
     
  4. LostKiwi

    LostKiwi Senior Member

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    Location:
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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    If the inside of the exhaust is black and sooty then no DPF.
     
  5. malcolm210

    malcolm210 Senior Member

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    If registration documents state EU5 the car is fitted with a DPF. As LK I would get the stat changed ASAP the OM642 usually warms up quickly and if not mpg will suffer and you may have DPF regeneration problems
     
  6. Avnt

    Avnt Senior Member

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    Location:
    Mexborough
    Your Mercedes:
    Mercedes c350 cdi estate amg
    Yeah get it changed. I did mine about a month ago improved fuel economy also less forced regens


    Sent from my iPhone using Tapatalk
     
  7. OP
    clarkey2311

    clarkey2311 Active Member

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    Your Mercedes:
    C350 CDI - 2011
    Full service today with all filters changed and fluids .... a read of the codes showed a fault on the thermostat sensor in the housing itself ... ordered new from MB to be fitted Monday ... cheers for the advise guys
     
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  8. Avnt

    Avnt Senior Member

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    Mexborough
    Your Mercedes:
    Mercedes c350 cdi estate amg
    Where did you go for service?


    Sent from my iPhone using Tapatalk
     
  9. OP
    clarkey2311

    clarkey2311 Active Member

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    Your Mercedes:
    C350 CDI - 2011
    Used a garage that I used when I had my BM, it’s called Deutsche Mark ... they specialise in cough cough .... German cars believe it or not
     
  10. Avnt

    Avnt Senior Member

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    Your Mercedes:
    Mercedes c350 cdi estate amg
    In Doncaster? Id have never thought they’d have been German specialists


    Sent from my iPhone using Tapatalk
     
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  11. OP
    clarkey2311

    clarkey2311 Active Member

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    Your Mercedes:
    C350 CDI - 2011
    Ha ha thanks but yes they do ;)
     

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