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W124 cabin temperature sensor blower location

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

  1. DanF

    DanF Senior Member

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    Hi,

    Hope someone can help me please!?

    My new 1995 W124 estate has a problem with the cabin temperature sensor which causes the cabin temperature to get really hot before settling down at the right temperature.

    I initially thought it was because the windscreen vents weren't opening but I've fixed those and still the same.

    I've now established that the air is not being sucked over the sensor next to the interior light. I've cleaned that and checked the tube is connected at that end but theres no sign of any suction.

    I took the passenger airbag out hoping to find the blower motor there but there is no sign of it there, or indeed the tube. I think it is there on a left hand drive car from reading the American forums.

    The tube from the sensor appears to run down the left side a-pillar.

    Does anyone know where exactly the blower is located so I can check it out?

    Thanks,

    Dan
     
  2. OP
    DanF

    DanF Senior Member

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    this part...

    Hi again,

    The part I am searching for is referred to here>

    http://www.peachparts.com/shopforum/tech-help/290091-w124-hvac-temperature-sensor-fan-r-r.html

    My understanding is that it is used on all the W124 - mine has air con rather than climate control.

    Does anyone know where it is on a RHD car? Maybe its somewhere around where the handbrake release handle and headlight switch is, behind there, but I'm not sure how to pull that part of the dash out... I think the tube must run down the right side A pillar on reflection.

    Thanks,

    Dan
     
  3. robparker

    robparker Senior Member Authorised Forum Supporter

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    Your Mercedes:
    C55 (203), 220d (115), 200d (110)
    Not sure on the tube, but the blower is located under the wiper motor accessable under the bonnet... unless you have after market aircon installed in which case its a dash-out job to get to the motor.
     
  4. OP
    DanF

    DanF Senior Member

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    Hi Rob,

    Thanks for your reply. To clarify, its not the main blower unit that I am looking for but a small motor that provides suction to the tube by the sunroof button where the temp sensor is. I think that is either disconnected or broken as there is no suction and therefore the cabin temperature is not regulated properly.

    I think this is a small box covered with foam somewhere behind the dash, on RHD cars its apparently behind the glovebox/passenger airbag, but I am struggling to find it on my LHD car.

    I think its number 113 on the picture perhaps?

    Thanks,

    Dan
     

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  5. robparker

    robparker Senior Member Authorised Forum Supporter

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    Your Mercedes:
    C55 (203), 220d (115), 200d (110)
    Ah, one of those. Yea I dont recall seeing one on a 124 (havn't looked) but on the 126's its certainly behind the glovebox, up under the dash, but no experience of LHD ones though, one would think it would still be under the glovebox on that side, but sorry, im not sure.
     
  6. OP
    DanF

    DanF Senior Member

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    Thanks again Rob,

    Sorry I got my lefts and rights wrong, mines a RHD car.

    It's on the LHD cars that this box is behind the glovebox ie on the right hand side of the car; on my car the speedo and stuff is there so perhaps its behind all that somewhere...

    Cheers,

    Dan
     
  7. grober

    grober Senior Member

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    Your Mercedes:
    W204 C200cdi estate
    I have a feeling that this pipe is simply plumbed into the heater air intake as a venturi nozzle on most models [ a bit like a carburettor jet functions] and its only the models with a sunroof that have the blower unit part no A0008301908 The blower if its present ? is still going to be behind the glove box or passenger airbag assembly as you surmise. You probably won't get any "suction" on the non blower setup unless the heater blower itself is on?
    ps the sensor if its that is part no A1268301472
     
    Last edited: Nov 29, 2012
  8. OP
    DanF

    DanF Senior Member

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    Thanks Graeme,

    Looks like I'll have to have the dash off again to look around there although it did seem a little better today perhaps now I've hoovered the dust from around the sensor. When this system works well it works really well as it did in my old saloon, I think its one of those things that makes these old mercs really special.
     
  9. Bolide

    Bolide Senior Member

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    Your Mercedes:
    BMW 525 Diesel Touring
    It's up behind the airbag / glovebox somewhere but it's wrapped in foam. If you can find where the pipe comes out of the A pillar you should be able to track it to the pump. The pipe has longitudinal ridges - it's easy to identify by touch

    Nick Froome
     

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