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Thread: Cold air on passenger side

  1. #11
    Join Date
    Jan 2009
    Location
    milwaukee,wi
    Posts
    16

    Default

    i have a question.. my heat gets generally warm but for some reason the vents in between the seats blowing towards the rear blow cold air. for now i just close them but im wondering why that might be. its not like warm air either its really cold air like its from outside

  2. #12
    Join Date
    Mar 2006
    Location
    Derbyshire, UK
    Posts
    871

    Default

    Quote Originally Posted by adrian.j View Post
    i have a question.. my heat gets generally warm but for some reason the vents in between the seats blowing towards the rear blow cold air. for now i just close them but im wondering why that might be. its not like warm air either its really cold air like its from outside
    They're designed to do that.

    1997 535i V8
    5spd, OBC, A/C, cruise, BMW phone, factory M-Tech wheel & suspension, 18" Alpinas

  3. #13
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,463

    Default

    Yeap no hot air comes through that vent, it would be nice if you could control it.

  4. #14
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,051

    Default

    do you mean vents in center console rear end? If that is the same like on the E32, that is only ambient air, hot air comes from under the seat.


    http://bmwe32.masscom.net/johan/cent...ts_v1.1-1.html

  5. #15
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,463

    Default Still no heat

    Shogun
    Finally it is warm enough to work on the 5. Pulled the center console and inspected the stepper motor on the right side of the heater/air box, it works fine so I don't know what is causing only cold air to come out of the vent marked with the yellow arrow. Should I get warm air from any of the other vents on the passenger side? Passenger floor? Right side of console? Knee area on passenger side? It seems to me if it where a broken flap then I should get warm air from all the the other passenger vents except the one marked with the yellow arrow? Is this how it works?

    Quote Originally Posted by shogun View Post
    do you mean vents in center console rear end? If that is the same like on the E32, that is only ambient air, hot air comes from under the seat.


    http://bmwe32.masscom.net/johan/cent...ts_v1.1-1.html

  6. #16
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,051

    Default

    The system is quite complicated and maybe you try to understand the German here, only about 50 pages ;-)
    training material for BMW technicians
    called
    Klimaautomatik IHKA (German language PDF)
    and you find it here, scroll down
    http://www.e38.org/e32/
    There are also a lot of drawings and data to check, for example each temperature sensor in the system, how to check and which data it should show at which degree Celsius.

    the control of each stepper motor is done by the IHKA control unit and it even compares the speed and things like that.

    Have you checked the flap you can see from the outside when you remove in engine room the black cover at the firewall to access the blower motor?
    As I mentioned some month back, the motor for the 2 outer flaps is on the driver side, and the passenger side flap is regulated from this motor too, bith with a bpowden cable. Maybe that is broken? Or just slipped out of the place where it should be?

    More to check here
    http://bmwe32.masscom.net/johan/ihka/ihka.html

    Edit: you mentioned the stepper motor works, but did you remove the stepper motor and check if the flap is broken?

  7. #17
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,463

    Default

    I will check this out this weekend

  8. #18
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,463

    Default Found the problem

    Found the problem. I pulled the vent cover in the center of the dash and looked down inside. Turning the ignition on and off the vent on the left moved with the step motor the vent marked with the yellow arrow did not. When I turned on the blower the vent on the right popped open, when I held it closed with a screwdriver heat began to blow out of the right vent. So it looks like this vent has no control. Now the question is do I have to pull the IHKA or can I fix it in place? I downloaded the manual and am trying to figure out which stepper motor controls the center vent. Looks like I am in for a evening of Google translation. Man I pray I don't have to pull the IHKA it looks like a real pain.



    Quote Originally Posted by shogun View Post
    The system is quite complicated and maybe you try to understand the German here, only about 50 pages ;-)
    training material for BMW technicians
    called
    Klimaautomatik IHKA (German language PDF)
    and you find it here, scroll down
    http://www.e38.org/e32/
    There are also a lot of drawings and data to check, for example each temperature sensor in the system, how to check and which data it should show at which degree Celsius.

    the control of each stepper motor is done by the IHKA control unit and it even compares the speed and things like that.

    Have you checked the flap you can see from the outside when you remove in engine room the black cover at the firewall to access the blower motor?
    As I mentioned some month back, the motor for the 2 outer flaps is on the driver side, and the passenger side flap is regulated from this motor too, bith with a bpowden cable. Maybe that is broken? Or just slipped out of the place where it should be?

    More to check here
    http://bmwe32.masscom.net/johan/ihka/ihka.html

    Edit: you mentioned the stepper motor works, but did you remove the stepper motor and check if the flap is broken?

  9. #19
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,051

  10. #20
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,463

    Default Which motor?

    Which motor 2 or 3 controls the left center vent marked with the yellow arrow?


    Quote Originally Posted by shogun View Post
    here the stepper motors are marked
    http://bmwe32.masscom.net/johan/ihka/ihka.html

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