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heater fan not working?

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by dannyh, Dec 19, 2012.

  1. dannyh

    dannyh Member

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    Your Mercedes:
    B 180 2006 2.0
    The fan for the climate control has stopped working and doesn't kick in when I press the quick clear button either. Is th is going to mean an expensive trip to Mercedes?
     
  2. television

    television Always remembered RIP

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    I do not know much about the B class, but have you tried the fuse for the fan
     
  3. OP
    dannyh

    dannyh Member

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    Yes checked all fuses and thy are ok and an auto electrician has tested for power to the fan motor but what was about as much as he could look at
     
  4. huey

    huey Senior Member

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    Heater resistor? I am not sure where it is on a B Class, hopefully some one can help you soon.
     
  5. television

    television Always remembered RIP

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    There are 3 parts to the system

    The control unit, these hardly ever give problems, they have an output of between 0 and 7 volt, 7 volt being the highest.

    The fan motor, these have carbon brushes, doubtful if they are worn out on a 06 car, but motors can fail.

    The series resistor is the most common fault, particularly if water has got into the heater box with all the rain of late.

    these have just the live wire to the fuse
    A wire from the control unit
    A ground connection
    The live to the motor ground lead.


    40.45 series resistors
    30 the motor

    [​IMG]

    I may be able to find some instructions for getting to the motor
     
  6. OP
    dannyh

    dannyh Member

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    Wow thanks for the last reply! Unfortunately that's all above my head! I'm hoping an after market warranty covers it just waiting to hear back from them unfortunately with x mass round the corner I fear I will be having to get bye until next week :(
     
  7. television

    television Always remembered RIP

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    It could be plus 25c for Christmas :rolleyes:
     
  8. OP
    dannyh

    dannyh Member

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    That would be nice! All tho I would just settle for dry! Driving in the rain with a windscreen you can't clear is not the best idea in th e world, even worse in the dark :(
     
  9. OP
    dannyh

    dannyh Member

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    Turns out it was the heater fan resistor had a quote for the new part (genuine from Mercedes) and labour of £300 is this good value?
     
  10. television

    television Always remembered RIP

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    Rather expensive I feel, cheaper with an indie, but what do you do:(
     
  11. OP
    dannyh

    dannyh Member

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    that is with an independent! and includes the labour and the part and VAT got to waot till thursday next week at the earliest due to the part coming from germany
     
  12. television

    television Always remembered RIP

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    OK,, It could be fiddly as the part is in the end of the heater box and the fan not dropping down like most cars. The part is probably near the £100 mark.
     
  13. OP
    dannyh

    dannyh Member

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    well thanks for your help and advice much appreciated! i'll just have to put up with wearing a scalf and hat while im driving! you never know i might get a knitted wooly jumper for crimbo! that would keep me warm!
     

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