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Thread: Nasty water valve issue that drains batteries

  1. #1
    Join Date
    Apr 2018
    Location
    Orlando, Florida
    Posts
    2
    My Cars
    1991 BMW 850i

    Nasty water valve issue that drains batteries

    Water valves always hot and drain battery

    I have a recurring problem lately and discovered it by mistake. I noticed that my batteries drain rapidly. almost over night. By mistake i touched the water valves next to the positive post on the car and I got as heat blister instantly from touching it. I measured it with my FLIR camera and it was at 165 degrees. I looked at all the fuses and engine parts with the camera and the only thing active was the water valves. All the fuses and relays were room temp. Why is this happening? Could it be relay 33 stuck open or closed? I switched the relay with the one next to it and it still did not affect anything. Is there something else that I may be missing?

    Before I start throwing parts at it, I tested the connection and I get power to the wires, of course. I have a brand new heater water valve (PN 64118391417) and plugged it in. I can hear the individual valves open, but then again, so does the one currently mounted on the car. What is wrong?

    I looked for the heater control module or they call it RELAY BOXINDEP.VENTIL.SYS/-HEATER SYS. (61311379737) that is in the passenger side glove box (according to ETK). My car does not have the control module in that location. Any ideas where a November 1990 car would have the module?

    I also pulled all the relevant fuses and listened for the water valves to engage and disengage. HELP!

  2. #2
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    7,075
    My Cars
    99 840ci Sport Indv
    The fuse relevant to the heater valves is F1 - if that is removed the heater valves should switch OFF - make sure they lose their 12V supply, if they don't something else is going on! I would expect that 12V to disappear.

    The controller for the heater valves is the IHKA, which is located between the footwells in front of A/C unit and is a bit of a blighter to get to. It is possible that the IHKA has failed - but first make sure it is actually switching OFF (not powered). The water valves are powered ON to close them - if the IHKA is still powered then putting the drivers temperature control to maximum should switch them OFF - check that as well.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  3. #3
    Join Date
    Apr 2018
    Location
    Orlando, Florida
    Posts
    2
    My Cars
    1991 BMW 850i
    Thank you! This will be my quest for this week. I will look for the F1 fuse or is it fuse #1? I will start taking my foot wells apart and see what I find.

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