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Thread: Heater always blowing warm

  1. #1
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    Default Heater always blowing warm

    Ive noticed the air from the drivers side windscreen vent is always luke warm, even when I have the temp guage down to full cold. As far as I can feel its the only vent thats doing it, seems ok from others...

    I was wondering why I was getting so hot in the summer, I just put it down to it being a black car

    What will be causing this ? Is this the heater sword thingy? I wonder if this could be related to my small coolant leak ?

    Anybody with any knowledge on this?

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

  2. #2
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    heater valves under the hood on the firewall are probably gunked up and not closing. I think Shogun has a link to that somewhere.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3
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    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
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    Cheers guys, thanks for the link regal will read through it.

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

  5. #5
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    I knew i'd find something, just took a while.

    http://www.bmwe34.net/e34main/Mainte...eaterValve.htm
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #6
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    Quote Originally Posted by 632 Regal
    I knew i'd find something, just took a while.

    http://www.bmwe34.net/e34main/Mainte...eaterValve.htm
    I will try the tapping on solenoids trick tomorrow, see if it frees them up. Good chance things have become sludged up as the car is 15 years old !

    Im reading through every thread on this I can find now too lol

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

  7. #7
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    I have a feeling my aux water pump isnt working any more as it takes ages for my car to give me cabin heat when started from cold.

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

  8. #8
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    while I think about it , I used to hear my heater valves *thunk thunk* occasionally from the inside of the car ... and I dont hear this any more.

    Does the thunking noise they make mean they are working properly?

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

  9. #9
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    Quote Originally Posted by Rory525
    while I think about it , I used to hear my heater valves *thunk thunk* occasionally from the inside of the car ... and I dont hear this any more.

    Does the thunking noise they make mean they are working properly?
    The do click as they open & close in order to regulate the temp.
    They require power (12volts) to stay in the off position.
    So loss of power to the valve solenoids will result in full heat.
    Handy when your heater valve fuse blows at 20 below!
    This also accounts for the slight burst of heat out of the vents after stopping and restarting the engine with the heater in the off position. With the ignition off the valves open and some heated water will syphon into the core until power is reapplied and the valves close.

    The 12volt supply is constant with the grounds (one for each valve) being switched to power the solenoids and operate the valves.
    Provided there is no issue with power, sticking is often caused by the failure of the seals that are supposed to prevent water entering the solenoids.
    Crap then builds up between the valve shaft and solenoid causing sticking.
    Tapping may help free the valves temporarliy but the condition is generally terminal.
    Last edited by pundit; 02-26-2006 at 03:34 PM.

    1990 E34 535iA, 215,000kms (130,000 miles).
    Dual Climate, Rear Headrests, Rollerblind, M-Tech Wheel,
    Memory Seats, EAT Chip, T-Stars.

  10. #10
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    Thanks for the info Pundit.

    I will have a poke about the valves tomorrow, pretty sure they are playing up. I also think my aux pump has gone as the cabin heat isnt that great, particularly when car is idling.

    1991 BMW 525i sport manual, BBTB, Mintex Extreme Pads, Bilstein dampers and Eibach springs,Viper2 chip, //M5 Replica.

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