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Thread: Heater relay under hood clicking

  1. #1
    Join Date
    Jan 2012
    Location
    Upstate South Carolina
    Posts
    319
    My Cars
    1996 840Ci / 2007 B7

    Heater relay under hood clicking

    I'm getting a clicking that sounds like a relay every 3-5 seconds or so coming from the heater hose bundle under the hood on the US drivers side up by he windshield (under the plastic cover that always breaks. New OEM unit. What should I be looking at for a cause?

  2. #2
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    8,871
    My Cars
    99 840ci Sport Indv
    That will be the heater valves - they continually open and close to control the heater-matrix temperature. Unfortunately some are quit noisy but operate fine....
    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
    Sep 2010
    Location
    Corpus Christi Texas USA
    Posts
    524
    My Cars
    850ci, M5, Alpina B7
    +1


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  4. #4
    Join Date
    Sep 2010
    Location
    Corpus Christi Texas USA
    Posts
    524
    My Cars
    850ci, M5, Alpina B7
    Someone does 3D replacement with earth magnets for that cover. Works and looks great.


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