2012 220cdi

Discussion in 'Engine' started by pcthrillrider, Apr 16, 2019 at 7:14 PM.

  1. pcthrillrider

    pcthrillrider Member

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    my car seems to take forever to warm up this morning it took 14 miles till up to temperature,yet on way home from work it took 7 miles? is this normal or do i have a thermostat problem?
    this is my 1st mercedes diesel
     
  2. AMGeed

    AMGeed MB Club Veteran

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    It should be warm within a couple of miles on a diesel.
    I would suspect a faulty thermostat. It should be reading around 85 -90C when fully heated up.

    If you decide to fit a new one, get an OEM one from the dealer, not an aftermarket part from ECP.
     
  3. CowleyStJames

    CowleyStJames Hardcore MB Enthusiast

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    My 2012 E250 takes 10/12 miles to fully warm up in this weather, I shouldn't worry about it.
    How long was your shift?
    The engine may have still had some warmth in it, so took less time to warn up
     
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  4. AMGeed

    AMGeed MB Club Veteran

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    Does it really take that long, even in April to get warm?
    Not very efficient at all if it takes that long.
     
  5. clk320x

    clk320x MB Club Veteran

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    Edit
     
    Last edited: Apr 16, 2019 at 7:54 PM
  6. AMGeed

    AMGeed MB Club Veteran

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    Fair enough Abs. My bad. I didn't realise they are so slow at warming up;)
    Another reason not to buy a diseasle:D
     
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  7. OP
    OP
    pcthrillrider

    pcthrillrider Member

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    i start at 05:45 and finish at 15:45
     
  8. OP
    OP
    pcthrillrider

    pcthrillrider Member

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    thats what i was thinking but arent they elec now? the on board computer can also turn off the water pump i heard
     
  9. clk320x

    clk320x MB Club Veteran

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    Lol I agree!! Have been looking at e55s! :eek::D
     
  10. MercedesDriver

    MercedesDriver Hardcore MB Enthusiast

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    OM651 is ridiculously slow at warming up. I’ve changed mine last September (OEM thermostat) and still much slower compared to my all previous petrol Mercs. In slow traffic in the mornings it takes 10 minutes to reach 85-90 deg.
     
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  11. andym2

    andym2 New Member

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    Any particular reason not to fit the one from ECP?
     
  12. markjay

    markjay MB Club Veteran

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    It's not EPC as such, it's just that many aftermarket thermostats are of poor quality.

    Buying an original one is the safest bet, though an OEM brand (e.g. Wahler) should also be fine.
     
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  13. Adam88

    Adam88 New Member

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    That’s quite normal tbh, I’ve drove down motorway for 20miles and my needle has just touched the right temp
     
  14. silver1011

    silver1011 Member

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    Diesels are far more thermally efficient compared to petrol, they'll always take longer to warm up.

    That's why most of them have ceramic heating elements in the vents and heated seats.

    If you're only travelling slow, in slow moving traffic or leave the stop/start system turned on, it will take longer to warm up, especially if it's cold and the heating system is calling for heat.
     
  15. CowleyStJames

    CowleyStJames Hardcore MB Enthusiast

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    In the winter, I tend to use the flappy paddles to hold car in higher gear to warm up engine quicker.
    Ironically, this was suggested by my MB dealer when I said how long warm up was taking
     
  16. TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    That sounds like a bad idea while the oil is cold and thick... (if the revs are too high).

    The car does it automatically, to a safe degree, in any case
     
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  17. Trickythemerc

    Trickythemerc Hardcore MB Enthusiast

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    Big lumps of cold steel and oil need to be warmed up under minimum load. Some folk think letting a diesel idle for a couple of minutes on a cold start is a good idea. Two things that are not good for cold engines are high RPM and being laboured by using too high a gear. On a very cold morning I let mine idle while I squirt the de-icer, set up the sat nav Etc. My usual route to the motorway is A & B roads with a 30 MPH limit and cameras, by the time I hit the motorway it is pretty much on the mark. I tend to keep off the throttle for at least the first 7 or 8 miles to give everything a chance to warm up fully. The car will hold the lower gears longer automatically in cold conditions.
     

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