1,6,7,8 - Series and Mini CooperGeneral Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.
I have a BMW X5 4.4 2000. Over night, the battery is going flat. Sometimes a fan keeps running somewhere under the hood (I can hear it best at the grills by the windshield). It does not run at a constant speed, it modulates erratically. So I suspect this is the problem. I also have a problem with the climate control where it modulates for no reason (from full fan to off). Could be related? Any ideas? Could it be a sensor or something??
The fan MAY be the fcooling fan from EML ( I have a '88 750 and that is a common sound on this car). Disconnect negative battery cable and hook amp meter between negative cable and battery negative post and you should see about 50ma, if not, start pulling and replacing fuses until the urrent draw falls to around 50ma and you have your culprit.
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