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Thread: No heat or lack thereof

  1. #1
    Join Date
    May 2006
    Posts
    6

    Default No heat or lack thereof

    I have noticed that there is cold air coming out of any of the interior dash and floor vents on the left side of my vehicle. Altoughh I rotate the temperature knob all the way to 80 degrees and back to zero there is no change in the air temperature. The air coming out the dash and floor vents on the right side is warm and it responds to variations when I rotate the ride side knob.

  2. #2
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,249

    Default

    it looks like your hot water valve for the left side is stuck.
    Try to bang it with a mallet, sometimes it helps.
    Next : the temperature sensor is defective on that side.
    Next: the potentiometer is defective to adjust the temperature

    First thing you should try: disconnect the power (the plug on top of the heater valves) from the heater valves. No power = valves are (or should) be completely open). If not, valve is stuck

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    right, electric power is only to close the valves. they become crusty and get stuck if the system is dirty.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    May 2006
    Posts
    6

    Default

    Its an 89 535i

  5. #5
    Join Date
    Feb 2004
    Posts
    291

    Default Don't forget...

    There are small electric motors that open and close flaps in the HVAC system. When I had a similar problem, one of the motors had disengaged from the socket it was mounted in. The motor still worked, it just didn't turn the flap it was supposed to. Something to think about. The motors are located on the HVAC system behind the radio. You'd have to check the Bentley manual for exact locations.

    Grace and peace,

    Robert K
    1991 535i

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