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Thread: Cold air on passenger side

  1. #1
    Join Date
    Jan 2007
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    Dayton Ohio
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    Default Cold air on passenger side

    Pulled the heater valve today and cleaned it. Checked to see if the solenoids were working properly, they were. Ran the car and still cold air on passenger side.....Disconnected the wires to the heater core and drove it again but still cold air on the passenger side. By theory if there is no power to the heater valve solenoid I should be getting hot air....correct? Why would I only be getting hot air on the drivers side and cold air on the passengers side?

  2. #2
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    Default

    What does this flap do?

    Passengerside temperature mixing flap

  3. #3
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    Default

    Following my logic. Kind of scary huh??? Anyway I now believe the problem lies with the cold air flapper on the passenger side. My reasoning is that prior to this problem when ever I would turn off the blower motor I would hear a thump after about 60 seconds. It no longer does this. I now believe this was the cold air flapper on the passenger side, and it was on its way out. Question now, is it the stepper motor, the linkage rod between the stepper motor, or the flapper itself. I know I will have to remove the front console to access the stepper motor but will I have to disassemble the IHKA to repair a broken flapper. I have seen picture of these beast and it looks pretty scary.

  4. #4
    Join Date
    Mar 2008
    Location
    NY
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    Default

    Are there two flaps? The reason I ask is that my car sat for so long that they must have been sticking. Then one day I after about 60 seconds I heard the thump and assumed it was some sort of heater flap. I do not have heat on passenger and posted about it. It was deemed that I may have a stuck solenoid but I still need to address it. Maybe I have a flapper problem.
    1952 MG TD
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  5. #5
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    Yeah mine was always a thump after a few seconds of gears whining and then silence. I pray the flapper is not broken. I have a driveshaft to put into my 7 so the flapper will have to wait

  6. #6
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    May 2004
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    Japan
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    On my E32 750 from 10/88 parts car I removed all parts and studied that. On left side of the IHKA unit there is a stepper motor, and that is connected with both flaps, left and right side with a bowden cable.
    You can access that the same way as you want to get to the blower fan motor.
    http://bmwe32.masscom.net/johan/ihka/ihka.html

  7. #7
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    I am going to try to make the repair this weekend. I am hoping I can make the repair without having to pull the dash. It will be very cold this weekend and even with a semi heated garage you can still have problems with plastic parts. I may have to wait for warmer days. Tomorrow I am hoping to get the driveshaft installed in the 7. Does anyone know why BMW put a two part driveshaft with a center bearing in these cars? There's not a lot of travel in the rear end.

  8. #8
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    Oh something I forgot to ask??? Is there a fuse on these stepper motors? One for each motor?

  9. #9
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    On the E32 I am hundred percent sure, no need to remove the dash, just then glovebox, the center console, the metal arm behind that from chassis to center console, the radio and the OBC, and it helps to remove the front seats and the steering wheel, so you have more space to manouver. But not a absolutel must do.
    On E34 I am not sure, but should probably the same.
    Stepper motors do not have a separate fuse, all controlled by the IHKA unit.
    Make pics, Joe, and a nice short instruction how to do.
    And good Luck

  10. #10
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    Pics coming

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