[SOLVED] No/Little heat Merc ML270 CDTi

Discussion in 'Engine' started by JohnDavies, Mar 4, 2017.

  1. JohnDavies

    JohnDavies Hardcore MB Enthusiast

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    Firstly thank you for allowing me to join this fantastic club. I have a small problem ( i hope) in that when my engine is up to max temp i only get cold air in the cabin. Yet if i stop the car and park up for 4/5mins then restart the engine i get luke warm air even though my temp setting is at max. Could this be a sticking thermostat or maybe something else. Any comments would be greatly appreciated. I have purchased a new thermostat in anticipation and will get that fitted but should i be looking elsewhere anyway?
     
  2. Stratman

    Stratman Hardcore MB Enthusiast

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    The thermostat is a known weakness on many MB engines including yours and is the first port of call when there are any heating or running temperature problems.

    What temperature does your engine run at? Does it fluctuate between traffic and the open road?
     
  3. OP
    OP
    JohnDavies

    JohnDavies Hardcore MB Enthusiast

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    ML270cdti & C200 Coupe
    Temp rises to just under 80 degrees and does not fluctuate. Just seems strange that i have to achieve this temp or just below it and have to turn off the engine for a few minutes then restart and presto some heat although only just warm heat. Had thought at one time i may have an airlock???
     
  4. Stratman

    Stratman Hardcore MB Enthusiast

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    80 is a bit low, it should be 90ish. It gets warmer after you switch off for a few minutes because the latent heat in the block heats the water a bit.

    Change the thermostat, it's an easy enough job. Just be careful of the plastic fuel pipes which run close to it, they can get brittle and crack.


    The holes in the housing for the brackets attached to it are not threaded, you use the screw to cut one as you drive it in.
     
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  5. OP
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    JohnDavies

    JohnDavies Hardcore MB Enthusiast

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    Excellent info, really appreciated, many thanks.
     
  6. Jane270ML

    Jane270ML Hardcore MB Enthusiast

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    When removing the old thermostat, don't drop/lose the black plastic tube located between base of stat & block.
     
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  7. OP
    OP
    JohnDavies

    JohnDavies Hardcore MB Enthusiast

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    Location:
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    Thanks for that info i shall be aware of it now. Brilliant club/members.
     
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  8. OP
    OP
    JohnDavies

    JohnDavies Hardcore MB Enthusiast

    Messages:
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    Location:
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    ML270cdti & C200 Coupe
    New stat fitted............i have heat.:bannana:
     

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