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C107 Heater problems.

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by richyba, Nov 28, 2012.

  1. richyba

    richyba Active Senior Members

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    Your Mercedes:
    1978 T1 307D,2005 Slk200K,1982 300DSLC (honest!) & 1994 410d Camper
    I have just bought my first classic Merc - a 280SLC which has been converted to an OM603 diesel from a W124, its a fine job but there are a few fiddling bits that need sorting, one came to mind last night - a distinct lack of heat!

    The temp gauge doesn't even flicker yet the rad is fairly hot but there aint a lot getting into the cabin so a couple of questions:

    Where is the temp sender on an OM603 engine and will it be compatible with the original C107 gauge?

    How are the heater taps controlled? - I'am guessing they are behind the centre console and most likely to be vacuum - any ideas again?

    I will be looking at a couple of scrap 107 s tomorrow so might be able to get an idea on how it works before I pull mine apart, of course the other obvious one is the thermostat stuck or not there and I shall have a look at that but it would be reassuring to know if the gauge works first!

    Thanks in advance and I will be posting a few not too stupid questions I guess but I try to do my share of answering to so your help would be appreciated!
     
  2. OP
    richyba

    richyba Active Senior Members

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    Any ideas anyone?:confused:
     
  3. toby1

    toby1 Senior Member

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    No idea here, but someone will be along
     
  4. Dec

    Dec Senior Member

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  5. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    From memory the temp sender is located toward the rear of the engine, n/s around cylinder 4. Early temp senders had x1 wire and later ones x2.
    The hot/ cold function is controlled by a vacuum operated heater control valve located on the bulkhead [in the engine bay]. You can test the vacuum going to this or operate it manually
     
  6. Alex Crow

    Alex Crow Senior Member

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    +1

    Hot water flow is supposed to be constant, unless both heat control sliders are in full cold position.

    Is it even plumbed in?
     
  7. OP
    richyba

    richyba Active Senior Members

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    It plumbed I have found a vacuum valve at the bulkhead which is broken at the operating arm, my guess is that it came from the 124, I have jammed it open and there is heat but it cools rapidly so I'am guessing the engine is running cool, I guess I should obtain a new valve (or better still a S/H one and then maybe plumb the vacuum into the interior sliders. I haven't got the temp gauge sorted yet but it doesn't seem particularly hot so I'am thinking the thermostat would be no bad idea at this stage. I reckon I might need a quantity of vacuum pipe and joiners in the near future!:rolleyes:
     
  8. Alex Crow

    Alex Crow Senior Member

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    Guessing you might find the thermostat has been taken out...enjoy :D
     
  9. OP
    richyba

    richyba Active Senior Members

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    Tanks for that, that is what I was thinking, are they a bit of a job? The housing looks fairly awkward to get at are they prone to being seized? There aint a lot of room for violence!:lol:
     
  10. Alex Crow

    Alex Crow Senior Member

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    Not too hard to do on the 603 really, mounted on the O/S of the block, adjacent to the water pmup.
     

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