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Heater blower stuck on max

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Bikesnoopy, Nov 24, 2012.

  1. Bikesnoopy

    Bikesnoopy Senior Member

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    2003 A210 Evo
    Hello. . .
    I know its not usual to join a forum with no introduction & go straight in with a question, but i'm desperate!:(

    I've just bought a beautiful 2003 A210 Evo LWB & i love it to bits.
    Its in perfect condition in every way except that the heater blower is stuck on max.
    The distributor control works fine. The temp control works fine. The air con works fine. Its just the blower.

    It doesn't matter what position the switch is in - 0, 1, 2, 3, or 4, it still blows on max as soon as the ignition is turned on & the only way to turn it off is take the fuse out!

    Can anyone shed any light on this, or have i bought myself a load of expensive trouble.

    Apologies once more for joining the forum with a "help me" question!
    I hope to participate more in the future:)

    Regards
    Denis
     
  2. whitenemesis

    whitenemesis Senior Member

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    Welcome to the forum :)

    No need to apologise! That's what we are here for and some one will be along soon with suggestions
     
  3. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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  4. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    Anyone got any ideas?

    Im driving around with a gale blowing up the screen. . . OR im misting up if i want a bit of peace & quiet & take the fuse out!!!:(
     
  5. whitenemesis

    whitenemesis Senior Member

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  6. huey

    huey Senior Member

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    I would guess the resistor is shot:sad:
     
    Last edited: Nov 25, 2012
  7. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    Hmmmm. . . is that a difficult/expensive job?:confused:

    Thanks for to replies.
     
  8. huey

    huey Senior Member

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    I priced one up for my 124, yes expensive, luckily it was'nt that, it was one of the fans stuck and I was able to fix it.

    If you read the link Whitenemisis put up for your model they are not expensive.
     
    Last edited: Nov 25, 2012
  9. whitenemesis

    whitenemesis Senior Member

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    Read the link I gave you! It's explained in the write-up.
     
  10. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    £23.93 + vat for the part. . . & 20 - 30 minutes to fit? Am i reading that right?!
    If so, that's a breeze!


    The only thing is, that the problem in the link isn't EXACTLY the problem i have.
    His fan only worked on max. . . but in other positions, it would turn off. I could live with that for a bit.

    However, mine is STUCK on max. It doesn't matter what position the switch is in, it still blows on max. The only way to shut it up is to remove the fuse, or switch the ignition off.

    Does this sound like a resistor problem, or something more sinister. . . :|
     
  11. whitenemesis

    whitenemesis Senior Member

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    Get the car on STAR and read the fault codes.
     
  12. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    STAR? What the hell is that???
     
  13. whitenemesis

    whitenemesis Senior Member

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    STAR is the Mercedes diagnostic system. It can interrogate the car's systems and help pinpoint the problem. All dealers and most good independents have it.
     
  14. Frontstep

    Frontstep Senior Member

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    Sounds like a resistor problem to me.
    They are a common failure it would be cheaper to fit the resistor than pay for a Star diagnosis.
     
    Last edited: Nov 25, 2012
  15. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    I'm a Service Advisor at a Vauxhall Main dealer.
    I guess Star is Merc's equivalent of Vauxhall's Tech2 then.

    Yes, i was trying to avoid having to have diagnostics done by a Merc dealer. . . I know how much I charge for diagnosis at Vauxhall . . . !

    Maybe i'll just get a resistor & fit it. If it not that, ive only lost £30. . . :|
     
  16. Frontstep

    Frontstep Senior Member

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    The resistors are becoming so unreliable they will become part of a service soon, the Chinese are turning millions out.
     
  17. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    I'm just not convinced it's anything to do with the resistor.
    If it was that, it would "default" to max, but switch off in all other positions.

    Could it something as simple as the switch has failed. . . :idea:
     
  18. michaelr1946

    michaelr1946 Banned

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    Hi , had this happen a few weeks ago , only difference was mine kept going with ignition off and key out !. It turned out to be the blower "control module" shorted out , got it replaced , part cost was around £80 and then a couple of hours labour to do it .
    Cheers
    Mike R.
     
  19. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    Thats interesting Mike. . . food for thought there :neutral:
     
  20. OP
    Bikesnoopy

    Bikesnoopy Senior Member

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    Found it!

    Its the heater control unit.

    Can get one for around £45 & get it fitted at work, so just a cheap fix.

    Excellent result :D
     

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