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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 01-06-2012, 10:11 AM   #1 (permalink)
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airconditioning stays down after turning off ignition

hello,
i have a 320D touring 2001 and i have now the problem that the airconditioning keeps running while the ignition is off. this drains the battery. i have pulled the CB of the airconditioning, 28 62 63, but that does not help.
Has anybody seen this before? how to solve this? how to disable the airconditioning? now i am left with taking off the battery everytime i park otherwise the battery will be flat.
many thanks
wizzard
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Old 01-06-2012, 01:36 PM   #2 (permalink)
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The belt runs the pump, so if engine is off, aircon is too, must be a blower fault.
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Old 01-06-2012, 03:03 PM   #3 (permalink)
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hi Dabsy,
nice plates! thanks for quick reply.
if it is not the aircon but the fan that remains on what can i do about this? i find it strange that having poppod the cb's aircon/heater that the fan would still be running. is this straight wired to the battery? and so where can i found it to disable this, could it be a temperature sensing mechanism be?
again thanks for reply
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Old 01-06-2012, 03:08 PM   #4 (permalink)
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You're welcome...
The aircon clutch is activated electrically, as while the engine is running, the belt still turns its pulley... Engine off, no aircon. Could be a short in the wiring to the blower, or that damn "hedgehog" resistor connected to the blower !!
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Old 01-07-2012, 03:45 AM   #5 (permalink)
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where would i be able to find this hedgehog resistor, i have no haynes book or technical documents. would this be a big job to be modified? does the whole resitor need to be replaced?
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Old 01-07-2012, 11:47 AM   #6 (permalink)
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This can be a pain to get to, in my UK car it is under the driver's footwell towards the centre (Right-side) attached to the blower... These were updated late nineties but still caused issues (not as much).
Worth testing the wiring etc. before blaming that (unless you can get a spare to swap/test)...
HTH

Just to add - BMW's are vertually identical world-wide, just the steering wheel on opposite sides lol
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