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Thread: heat through defrost vents but not through cabin vents

  1. #1
    Join Date
    Jul 2004
    Posts
    34

    Default heat through defrost vents but not through cabin vents

    Heat is coming out of the vents by the windows - I think that's the defrost vents - and the foot vents. But only cold air is coming out of the vents that blow directly on you.

    There's a dial on direct vents with blue and red. I turn it to red and it still only blows cold.

    Any ideas?

  2. #2
    Join Date
    Dec 2003
    Posts
    535

    Default

    the defrost vents are on the top of the dash, an inch or so behind the windshield. The top register, above the register with the wheel control, corresponds to the top lever on the climate control; the middle one controls the wheel one and the ones that go through the doors, and the bottom lever controls the footwells and the rear.

    Make sure all the climate control levers are over to the right, and the wheel is all the way up into the red. Turn it on and check for heat. Now close the top and bottom lever, and close the vents on the doors using the thumbwheel.

    If any air is coming out now, it should be hot. If not, perhaps the bowden cable that cotrols the flap has detached, or perhaps one of the stepper motors has gone out.
    o/______\o
    (Oo=00=oO)
    []=****=[]

  3. #3
    Join Date
    Dec 2005
    Location
    Mt. Vernon Ohio
    Posts
    260

    Default

    Well my car blows cold out the center console for the back seats, thats why theres a blanket back there
    1993 525iA M50TU
    Black on Black...need pics
    208,888 miles

  4. #4
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
    Posts
    2,561

    Default Close the vent!

    Close the vent! it is supposed to allow fresh air only. Rear seat heat is though the vents under the front seats. Please read your manual if you have it. If not get a manual on e-bay or dealer.
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  5. #5
    Join Date
    Jan 2004
    Posts
    4,148

    Default You can see the distribution here, the rear seat upper

    vent is only for fresh air, not heated at all... the center duct in the dash has a combo of fresh and heated and the others provide heated..


  6. #6
    Join Date
    Aug 2004
    Location
    Chicago
    Posts
    20

    Default

    Well that expalins it then. I always wondered why the air was cold. I have a manual, bu t i must have skipped that part.

  7. #7
    Join Date
    Jun 2004
    Location
    Kentucky
    Posts
    648

    Default

    Let there be color:

  8. #8
    Join Date
    Aug 2005
    Location
    Toronto
    Posts
    1,720

    Default

    Yeah, that's normal.

    It's part of BMW's "stratified" air system. The theory is that you've got warm air coming out of most places to keep the interior cozy, but cool air on your face to keep you awake.

    If you don't want the cool breeze just close off the face-level vents 'til spring.
    .


    Jay Lebo - Toronto, Canada
    1990 BMW 535i
    5-speed conversion
    Lightened flywheel
    Sachs Suspension Kit
    E.A.T. Chip

  9. #9
    Join Date
    Dec 2005
    Location
    Mt. Vernon Ohio
    Posts
    260

    Default

    Thats nifty, I remember seeing that now, *dumbass*
    1993 525iA M50TU
    Black on Black...need pics
    208,888 miles

  10. #10
    Join Date
    Mar 2005
    Location
    TORONTO
    Posts
    3,011

    Default

    Of course I surmise that if the climate control is set to cool, then all the vents will have cool air regardless... right? It's just the warming that is selective...
    :: HIDCanada.com | Illuminating Your World


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