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Thermostat ?????

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by joderest, Oct 8, 2018.

  1. joderest

    joderest Senior Member

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    Your Mercedes:
    ML270 2003
    Ok, i have a question.
    ML270, been fine all summer, temp gets to just over 80 in about 5 miles.
    This morning a bit colder, and it took a while, about 8 miles to warm up and reach just over 80 on temp gauge.
    Normal ?
    I have been to a Mercedes dealership, was shown a thermostat out of a Mercedes marked box, but it had Behr/Mahle stamped on it, is this OEM ?
    I can get same on flea bay for half the dealer cost.

    Just some advice if poss, car runs, starts and stops fine, has heat from heater almost instantly.
     
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  2. Oldspanners

    Oldspanners Senior Member

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    Your Mercedes:
    C CLASS 2004 C180
    I think you're being a bit premature there. If the temperature wasn't getting above 80 after 20 miles or never above 80 I would be time to change.
    On my C class the noticeable difference was in the MPG and it never got above 65C.
     
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  3. OP
    joderest

    joderest Senior Member

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    ok, thanks old spanners. ( i have old sockets !!!!!)

    Cheers
     
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  4. Jim2

    Jim2 Senior Member

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    Your Mercedes:
    2010 Eclass w212 2.1 CDI
    On another forum, one poster believed that in most cases where the temp is not rising fast enough, or behaving in a "Jumpy" fashion, 1st thing to do is a coolant flush and change, and see if that changes anything. He maintained that 1st thing people will do is change the thermostat, ( and as well, the coolant of course ) So the problem is solved, but it may have been just the coolant, and not the thermostat.
    I have recently flushed and changed the coolant in mine ( W212, OM651) and there was an immediate improvement.....seemed to heat up much quicker, and stay at 90c. But in the last few days, it seems to be taking a bit longer again to reach the 90c, ( falling temperatures may be affecting it) but once there, it stays dead on the 90. So I cannot rule out a thermostat just yet. Let us know how it works out for you, Joderast, if you would?
     
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  5. oigle

    oigle Senior Member

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    Location:
    Redcliffe, Queensland, Australia
    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    270 motor is always slow to warm up and only gets just over 80° even with a new stat. I wouldn't worry about it until it only gets to 70°.
     
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  6. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    As the air gets colder diesels in particular will take longer to warm up.
    Every time the piston draws air in with a diesel it's a full cylinder worth and at low throttle openings with small amounts of fuel injected that has a significant cooling effect leading to longer warm up times.
     
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  7. OP
    joderest

    joderest Senior Member

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    Your Mercedes:
    ML270 2003
    Thanks all.
    I think the thing to do here is buy a stat and keep it on the shelf until the temp does not reach 80 Odd, i think, but not sure its the original stat, as does not appear any work done in that area, although only 43,000 miles, its over 15 years old !!!!
     
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  8. thebiglad

    thebiglad Senior Member

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    Location:
    Central France
    Your Mercedes:
    2005 CLK 270 cdi
    It's getting much colder during the night, so your engines are having to warm up from a lower start temperature - so it takes longer.
     
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  9. OP
    joderest

    joderest Senior Member

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    there are lots of different thoughts here, so i suspect the best thing to do is change it, it does not look that hard, just being careful of the fuel pipes seems to be only warning.
     
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  10. Yugguy

    Yugguy Senior Member

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    Your Mercedes:
    C220CDI W204 Elegance Comand
    Stat is so simple to change it is worth doing, and yes, get the OEM part number and buy off ebay.
     
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  11. OP
    joderest

    joderest Senior Member

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    Your Mercedes:
    ML270 2003
    hmm, always the same, consider doing something on this car and it throws up something else.
    Last night the BAS/ESP light came on, it seemed to happen as i switched to dip beams, anyway, stopped, restarted, light gone, did not show this morning.
    and yes, will order up and change stat soon.
    i will update any improvement, but may be a few weeks.
     
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  12. daibevan

    daibevan Senior Member

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    Your Mercedes:
    W203 C200 Kompressor Elegance SE 2006
    My coolant is due to be changed after 15 years. I might change my stat at the same time to save having to replace the coolant for another 15 years.:):)
     
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  13. thebiglad

    thebiglad Senior Member

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    2005 CLK 270 cdi
    15 yr old coolant? - it's hardly got run-in yet Daibevan ;););););)
     
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  14. daibevan

    daibevan Senior Member

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    Your Mercedes:
    W203 C200 Kompressor Elegance SE 2006
    That's the recommended period!!!!!!!!!!! Don't believe it myself.;);)
     
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  15. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    I didn't either and do mine every 4 years. Alloy parts are too expensive to risk being corroded.

    Ian.
     
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  16. Jim2

    Jim2 Senior Member

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    Your Mercedes:
    2010 Eclass w212 2.1 CDI
    I did mine 2 weeks ago, so now I know exactly what kind of Anti-Freeze is in it ( Comma Xtream G 48, MB 325.0 spec ) It's leaking a tiny amount, and I can't seem to find the leak...….seems to be a slight water mark stain around the water pump, but now with the new blue coloured antifreeze, that might change as it may be easier to spot the leak.( I hope so anyhow. :) But meanwhile, I can now top it up when ever it needs it, without worrying about mixing two non-compatible anti freeze's together. Anyone have any suggestions about coolant leaks in the OM651? All suggestions are welcome...… LOL :)
     
  17. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Put in some UV dye. Kits are available on eBay...
     
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