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1986 735 I air vents

Discussion in 'E30 (1984-1993)' started by Ziphere, Apr 15, 2010.

    Ziphere guest

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    Any advise on why air vents send most of the air to defrost vents and a small amount to floor. All is working well on A/C except the vants changing
    • Member


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    This is a good source for troubleshooting E23 issues. I sold mine (and still regret it) in 2001 but you might find your answer here:


    Good luck!

    cwbiii guest

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    Theres a vacuum solenoid that operates a vent flap for each side of the system.
    Under the console there are a series of vacuum switches that control the various
    functions. Chances are one of those components is faulty or a vacuum control line is broken or off. You can test the function of the vacuum solenoid with a hand operated vacuum pump (same one as used to bleed the brake system, can purchase it from autozone for about $30) I had a lot of problems with various gremlins in both of my 733's, it was a chore to keep everything needed working.
    I'm assuming the 733 and 735 are quite similar.


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