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Thread: No Heat From Footwell Vent When Car is Cold

  1. #1
    Join Date
    Dec 2013
    Location
    Canada
    Posts
    7
    My Cars
    135i

    No Heat From Footwell Vent When Car is Cold

    Weird thing happening with my e39. When its below freezing and the cars cold, the footwell heat doesnt work. Nothing blows from the bottom. But when i turn it off and on when the cars warm it starts blowing from the bottom.

    On the flip side when its warm outside and I start the car cold it blows heat from the footwell right away. Everything else works.

    Side note - everything works, heat is hot and AC is cold. IHKA is tested and working and outside temperature sensor is working.

    Anyone have this problem before or know what to check?

  2. #2
    Join Date
    Oct 2010
    Location
    San Jose, CA
    Posts
    11,537
    My Cars
    1997 BMW 540i 6 speed
    Measure the coolant temp using the cluster. I suspect that the IHKA waits until the engine is at a certain temp before allowing the blower to run. That's what I have observed, anyway.

    Compare the coolant temp against the outside temp when the blower starts.
    Last edited by edjack; 10-15-2018 at 04:54 PM.


    Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

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