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Mercedes CLK200 coolant gauge problem

  • 04-01-2017 8:46pm
    #1
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭


    Folks,
    The coolant temp gauge on a 2005 Mercedes CLK200 Kompressor only works very rarely. Can anyone give me an idea what may be wrong? Thanks.


Comments

  • #2
    lookinghere
    Registered Users Posts: 60 ✭✭lookinghere


    Bif wrote: »
    Folks,
    The coolant temp gauge on a 2005 Mercedes CLK200 Kompressor only works very rarely. Can anyone give me an idea what may be wrong? Thanks.

    Could be a coolant sensor faulty


  • #3
    vw4life
    Registered Users, Registered Users 2 Posts: 285 ✭✭vw4life


    Replace the thermostat, very common fault with that engine


  • #4
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭Bif


    vw4life wrote: »
    Replace the thermostat, very common fault with that engine
    . Thanks...temp gauge reads right when it operates so wasn't thinking of thermostat but that may be it!


  • #5
    lookinghere
    Registered Users Posts: 60 ✭✭lookinghere


    vw4life wrote: »
    Replace the thermostat, very common fault with that engine

    Could be that all right it's best for him to check the simple things


  • #6
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭Bif


    lookinghere wrote: »
    Could be a coolant sensor faulty
    Do you know if the sensor can be changed without draining the coolant? Thanks.


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  • #7
    vw4life
    Registered Users, Registered Users 2 Posts: 285 ✭✭vw4life


    Bif wrote: »
    Do you know if the sensor can be changed without draining the coolant? Thanks.


    Yes it can, just make sure the coolant is cold.


  • #8
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭Bif


    vw4life wrote: »
    Yes it can, just make sure the coolant is cold.

    Cheers. Will I lose much coolant when I take out the sensor?


  • #9
    vw4life
    Registered Users, Registered Users 2 Posts: 285 ✭✭vw4life


    Bif wrote: »
    Cheers. Will I lose much coolant when I take out the sensor?

    Not much


  • #10
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭Bif


    vw4life wrote: »
    Not much

    Hi. I changed the sensor but no improvement. Same as with the the sensor Ireplaced the very odd reading comes up for a few seconds...any thoughts on what I should look at next? Thanks.


  • #11
    Tea drinker
    Registered Users, Registered Users 2 Posts: 2,817 ✭✭✭Tea drinker


    anthin up with the connector to the coolant temp sender?
    Gauge going? maybe hit it a rap and see if it works ;-)


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  • #12
    vw4life
    Registered Users, Registered Users 2 Posts: 285 ✭✭vw4life


    Bif wrote: »
    Hi. I changed the sensor but no improvement. Same as with the the sensor Ireplaced the very odd reading comes up for a few seconds...any thoughts on what I should look at next? Thanks.


    Change the thermostat


  • #13
    Bif
    Registered Users, Registered Users 2 Posts: 764 ✭✭✭Bif


    vw4life wrote: »
    Change the thermostat

    Thanks. Would the gauge show some reading after the engine was running for a while even if the thermostat was stuck open? The heating system seems to warm up quickly and the when the gauge does work it is at the correct temp.


  • #14
    landmarkjohn
    Registered Users, Registered Users 2 Posts: 702 ✭✭✭landmarkjohn


    A failed/failing thermostat can behave erratically. Stuck open, stuck closed, stuck halfway, sometimes works.... it's a mechanical component that will eventually fail and as other poster advised is common with this engine. It's a cheap part and if it doesn't fix it no harm done.

    Take it from someone who disappeared up is own you know what replacing water pump, timing belt etc etc when I think thermostat would have done it. In my case sometimes the coolant was getting so hot it was making the water pump squeal (I think)

    Rough guide if top radiator hose is hot and bottom hose stone cold it can be thermostat. Just my amateur DIY 2c.


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