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Temp gauge fluctuation

Discussion in 'General Mercedes-Benz Related Discussion' started by Dell, Jul 13, 2018.

  1. Dell

    Dell Senior Member

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    Joined:
    Feb 14, 2010
    Location:
    Warwickshire
    Your Mercedes:
    2015 C class C220 CDI Coupe silver
    Hi all
    The past two weeks my temp gauge has been fluctuating it used to be rock steady an 90 but now it it goes up to about 80 within 10 minutes then drops to about 70 then goes up to 80 and keeps moving up and down between 70 and 85.
    Last July I had New thermostat housing and I think that when you purchase it comes with sensor and stat,I have checked wiring connections has anyone any idea as to the problem C 200 CDI 2010
     
  2. grahamcol

    grahamcol Senior Member

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    Your Mercedes:
    2001 SLK230, 2000 C280 V6
    Could be the stat failing again.
     
  3. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
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    Certainly behaving like a faulty stat
     
  4. OP
    Dell

    Dell Senior Member

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    Your Mercedes:
    2015 C class C220 CDI Coupe silver
    Thanks for replying
    Yes that's my thoughts as well but I just strikes me as odd that temp gauge keeps going up and down faster than a tarts knickers on overtime.
     
  5. grahamcol

    grahamcol Senior Member

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    Your Mercedes:
    2001 SLK230, 2000 C280 V6
    Merc thermostats aren't very good. Both my W202 C280 and R170 SLK had new stats fitted soon after I bought them due to the stats tending to stick open and causing the engine temperature to be too cool. It's a very common problem.
     
  6. OP
    Dell

    Dell Senior Member

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    Your Mercedes:
    2015 C class C220 CDI Coupe silver
    Update
    I have noticed that if I stop and turn off then immediately turn on and drive off the temp will then go to 90 after a couple of miles but I can drive forever and it will not go to 90.
     
  7. grahamcol

    grahamcol Senior Member

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    Your Mercedes:
    2001 SLK230, 2000 C280 V6
    In my experience they become stuck open when the engine gets really hot and will then only close properly after the engine has gone stone cold again.
     

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