The heater/air conditioner blower motor on my 2001 BMW 740iL keeps running even when I turn the ignition completely off. What is going on?????
Country: United StatesMake: BMWModel: 740iLYear: 2001
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to confirm, the blower fan is what is still running? not the actual heat or AC itself? the control panel is not still on, is it? it is just the fan motor?
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Yes that is correct. The blower fan is running. The ignition is off and key is out. The engine is of course not running. The only way I can get the blower fan to stop is to pull Fuse #11, which is listed on the fuse box as one of the fuses for the air conditioner.
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thanks for confirming
this is a VERY common problem. Your final stage resistor, which is a small resistor unit which controls fan speed, has failed. The final stage is a very, very high failure part and is notorious for failing and causing the fan to run when the car is off. This is VERY VERY VERY common and is definitely your issue.
You will need to have your final stage resistor replaced. For now, you can pull the fuse for the blower to save your battery, as you have done.
Unfortunately on this model the entire dash board needs to be removed to access the final stage which is located with the blower motor itself, which is a very big and time consuming job.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
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thank you in advance.