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C220 No Hot Air

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by streaker, Nov 6, 2012.

  1. streaker

    streaker Active Member

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    Your Mercedes:
    C220 Estate 2004 2.2 Diesel
    Hi

    Hoping someone will be able to help,
    I've had my car for a few weeks, its a 54 reg c220 w203 diesel estate.
    If i select Hot air and the fan speed is at setting 2 or below i can feel a trickle of hot air from the vents, as soon as the fan speed is increased the air flow cools rapidly, Ive replaced the thermostat and new coolant the car runs at 90c and the pollen filter is new, all the vent flaps appear to be working correctly

    Any Ideas on where to look next ?

    Many Thanks

    Jaz
     
  2. kenb

    kenb Active Member

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    Your Mercedes:
    54 c220 crdi estate
    cold air

    i had the same problem as you,had thermostat changed and now hot air,
    good luck anyway

    ken
     
  3. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
  4. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    Matix can block on the C,class, back fushed a few for this fault!!
     
  5. OP
    streaker

    streaker Active Member

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    Hi Kenb,Television and Cole

    Thanks for replying, I've now tried the flap reset,
    I can hear the flap mechanisms cycling through for the various vent positions, the reset takes approx 30 seconds, I can get air from any of the preselect positions, the fan also responds as it should, there are no clicking or knocking noises on startup or when selecting different vent positions.

    The more I think about it I get the feeling its a flow problem through the matrix, hot water is getting to the matrix but as the fan speed increases the matrix cant keep up with the increased airflow across it,
    does that sound plausible ?

    Cole@MBS mentioned a blocked matrix and I've also trawled through a few
    threads which also mention Duo Valve problems and recirculation pumps,
    could failure of these parts cause a reduced flow through the matrix ?

    Many Thanks for all your help

    Jaz
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
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    On your car I think that Colin hit the nail on the head and a new matrix required
     
  7. OP
    streaker

    streaker Active Member

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    C220 Estate 2004 2.2 Diesel
    Cole mentioned a "Back Flush" I presume if he mentioned doing it a few times on c class's that it may help ? I think I understand the principle but i'm not sure where the in and out feeds for the matrix are ? and wether i should use any chemical cleaners in the process
    I really hope its not a new matrix !!!!!!!!! ouch

    Best
    Jaz
     
  8. television

    television Always remembered RIP

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    I can put up the details later of the connections
     
  9. OP
    streaker

    streaker Active Member

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    Hi Television

    That would be great, I really appreciate you guys trying to help

    Jaz
     

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