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A Class Auxillary Heating, or not?

Discussion in 'General Mercedes-Benz Related Discussion' started by Mega_angelic, Oct 30, 2012.

  1. Mega_angelic

    Mega_angelic New Member

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    Location:
    Cheltenham, UK
    Your Mercedes:
    W169 A-Class 2006 A200CDI (Brabus)
    Due to having a new job with a long commute I've traded in my Volvo S80 2.9 twin turbo, for a little A Class w169. A200 CDI.

    This is the first diesel I have ever owned so please excuse the ignorance... I thought diesels heat up much slower than petrols, however my heating comes on after a cold start within a minute.

    Which makes me think there is electrically powered auxiliary heating. (I don't have a manual and there isn't one online as far as I can find).

    However the last mercedes I owned had auxiliary heating and with it you could select a time for it to turn on using the dash computer. My current car doesn't have this option.


    ...So, does it have auxiliary heating but not the timer function, or is it just the engine heating quickly?

    If it does have auxiliary heating but the timer is an optional extra, is this something that can be added with a STAR or does it require extra hardware?

    Thanks in advance :)
     
  2. Ricardo_e220

    Ricardo_e220 Senior Member

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    Location:
    Newcastle upon Tyne
    Your Mercedes:
    R170 SLK230k 1999
    I have noticed this on my wife's a class and also on my e class...the latter has the rest feature, but not the w169... I'll be interested to know why when other vw and Audi cars I've had recently take forever in diesel format
     
  3. television

    television Always remembered RIP

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    Location:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Hello and welcome,,I do not know the A class very well but many Mercedes diesels do have an electric block heater, hopefully some answers will come in and welcome to the forum
     
  4. whitenemesis

    whitenemesis Senior Member

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    Your Mercedes:
    CLS55 AMG '05
    The E class has an electric heater that warms the incoming ventilation air. I don't know about the A class.
    This isn't related to the Rest function, which utilises residual coolant heat to warm the interior.
     
  5. npuk

    npuk Guest

    No aux heater in the a-class unless you have some retrofitted system.
     
    Last edited by a moderator: Oct 31, 2012
  6. OP
    Mega_angelic

    Mega_angelic New Member

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    Your Mercedes:
    W169 A-Class 2006 A200CDI (Brabus)
    Today I thought I'd time it, just so it wasn't just getting warm at a normal speed and me thinking it was quicker.

    It was 3'c outside and from the time I started the engine it took 1min40 to start blowing 20'c ish air from the vents.

    So definitely can't be coming from engine heat. I wish I had a manual!!!! I really resent paying dealer prices for one though! Lol
     
  7. EmilysDad

    EmilysDad Senior Member

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    Location:
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    Your Mercedes:
    ML350
    How about R Class? Mine warms up pretty quick too, so I'd suspected some kind of auxiliary heating. My brother's 7 series used to have a diesel powered Eberspacher type affair behind a front wing.
     
  8. whitenemesis

    whitenemesis Senior Member

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    Your Mercedes:
    CLS55 AMG '05
    I don't know but I'd imagine it has something similar to the E as most 'executive' Mercs have something to provide instant heat. The under-wing Eberspacher or Westabo type are options rarely ticked in the UK
     
  9. television

    television Always remembered RIP

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    These heaters only work on a timer as far as I know, and not when driving, the C and E can have the electric heat on the block, they pull 20amp and many have disconnected them when they have failed
     
  10. whitenemesis

    whitenemesis Senior Member

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    Your Mercedes:
    CLS55 AMG '05
    W211 has a PTC (electric) heater element fitted in the heater unit that comes on if:

    temp below 8C AND
    A/C switched on

    This often catches people out as, although the compressor is disabled at low temp to prevent evap freezing and this leads people to believe the A/C switch might as well be off, the PTC is switched off if the A/C switch is off.....because its in the A/C path through the heater box!

    It has a fuse equiv to 1700W and pulls about 1200W or so (think 1-bar electric fire).

    It heats the air coming into the cabin (nothing to do with block or cooling water circuit).

    (Thanks to W124coupe for this info)
     
  11. SL55 Mark

    SL55 Mark Senior Member

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    Thanks for that, I was wondering what that button did, but was too afraid to ask ! To be honest there are so many buttons I don't understand, I thought that one was for putting the passenger to sleep ! :D
     
  12. SL55 Mark

    SL55 Mark Senior Member

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    My (Diesel) landrover never really heated up on the way to work this morning, (crusty heater matrix, I suspect) so I would say those who are getting 20°C in 2 mins are doing rather well !
     
  13. Richardl

    Richardl Member

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    I think it may have something to do with the water cooled alternator. I think it generates warm air when it's cold. A shortened water run maybe? Or maybe I'm stoopid.....

    Sent from my Lumia 800 using Board Express
     
  14. OP
    Mega_angelic

    Mega_angelic New Member

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    Your Mercedes:
    W169 A-Class 2006 A200CDI (Brabus)
    Thanks for all the suggestions, I guess it's no hardship not being able to set it with the timer. I do miss that function though :)

    At least I don't have to wait 10 minutes for warm air to start blowing like my other halfs modus! :)

    I don't like the cold :)
     
  15. Ricardo_e220

    Ricardo_e220 Senior Member

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    I now know to switch on my ac on my s211 then! You learn xsomething every day :)
     
  16. Rory

    Rory Senior Member

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    Your Mercedes:
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    That seems a long time - I had an A Class as a courtesy car and, after standing all day outside my house I backed it out of the drive and within a couple of hundred yards of driving the air was starting to feel warm. As others have said, I assumed it was due to PTC heaters in the vents.

    I reckon my own car is churning out warm air in the sort of time frame you say, and that relies on the electric block heater. Note that only works when the car is moving, not at idle, as it takes so much current. The same may be true of the PTC air heaters too.
     
  17. Rory

    Rory Senior Member

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    In my W203 you can set the booster heater in the cluster computer to either off, off with a/c button or auto. I leave mine in auto and usually have the a/c button off and it appears to work fine.
     
  18. whitenemesis

    whitenemesis Senior Member

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    The booster heater in the 203 is a completely different. It has the heat the coolant and then only if there is surplus output from the alternator.
     
  19. Rory

    Rory Senior Member

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    I know, that's why I said block heater.

    It works surprisingly well, the snag is that you've got to drive off when the car is stone cold as it won't warm as idle so if it mists up and it's too cold for the a/c to work then that makes the first mile or so interesting.
     
  20. whitenemesis

    whitenemesis Senior Member

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    I remember it well. Interesting is one word for it!!
     

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