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Thread: e28 Revival - defrost works with heat, but does not blow heat anywhere else

  1. #1
    Join Date
    Dec 2015
    Location
    El Sobrante, CA
    Posts
    10
    My Cars
    1987 BMW 535is

    e28 Revival - defrost works with heat, but does not blow heat anywhere else

    So as I am slowly and patiently pumping life into my 1987 535is that I recently purchased. It had been sitting for 15 years atleast in a garage here in Northern California.

    I've been poking through posts and before I dive into an R&R session on the heater valve, I just wanted to get some clarity on something:

    The car once warmed up, does not pump heat through the main forward facing vents. It will run heat through the defrost, and as I slide the levers over to the left side, I can hear what sounds like the actuator switching directions. Right away the defrost vents are putting out heat.

    Does this add to sound like a heater valve problem is there something more or less problematic at work here?

    Thanks guys,

    Joe

  2. #2
    Join Date
    Nov 2018
    Location
    Lebanon, Ohio
    Posts
    2
    My Cars
    1984 BMW 528e
    I have a similar problem on my 1984 528e. Heat comes out the defrost vents, and floor vents, but the 'straight on' chest level openings in the dash only blow cold air at the same time hot is blowing out of the floor and defrost??? I haven't seen anything that might explain this. I have not pulled the whole dash assembly apart to see what's inside and was hoping for some direction.

  3. #3
    Join Date
    Oct 2008
    Location
    Kettering,OH
    Posts
    5,128
    My Cars
    e34 535i and 98 528i
    There is no heat from the center front vents. It is only fresh air. So if you are getting the vent heat and the floor heat you are doing well.


    Andy

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