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Old 03-14-2012, 04:20 PM   #1
Bobobo-bo Bo-bobo
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aux fan troubleshoot

After a front end accident, ive been replacing parts in my engine bay. I ordered a bosch aux fan and plugged it in to find that it doesnt work. I checked the fuses and they are all good. I turned A/C on and the fan doesnt spin. Does anyone know the name of the black box that clips onto the aux fan? Its not the relay that comes with the fan. Its cracked and some of the plastic is broken off so maybe thats the problem? My outside temp sensor also isnt working, could this have anything to do with why the aux fan wont turn on?
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Old 03-14-2012, 04:30 PM   #2
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After a front end accident, ive been replacing parts in my engine bay. I ordered a bosch aux fan and plugged it in to find that it doesnt work. I checked the fuses and they are all good. I turned A/C on and the fan doesnt spin. Does anyone know the name of the black box that clips onto the aux fan? Its not the relay that comes with the fan. Its cracked and some of the plastic is broken off so maybe thats the problem? My outside temp sensor also isnt working, could this have anything to do with why the aux fan wont turn on?
The box is your AUC sensor and has nothing to do with the fan. You may have gotten a china re box Bosch fan. Have you verified power and ground to the AUX fan?
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Old 03-14-2012, 06:34 PM   #3
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I am 90% confident that your electric fan only comes until certain conditions have been met by the DME. To test whether the fan is working you can always connect the power and ground directly to a 12v source and see if the fan will spin.

good luck!
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Old 03-15-2012, 01:23 AM   #4
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I will try to hook it up to a 12 volt tomoro, I bought it off a popular site autohausz or something like that so I hope its not china made. Can I take a voltmeter to the pos/neg leads on the plug going to the fan to check for current?
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Old 03-15-2012, 01:29 AM   #5
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I will try to hook it up to a 12 volt tomoro, I bought it off a popular site autohausz or something like that so I hope its not china made. Can I take a voltmeter to the pos/neg leads on the plug going to the fan to check for current?
Yeah. You could to check voltage. I wouldn't recommend attempting to test amperage.
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Old 03-15-2012, 02:00 AM   #6
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Yeah. You could to check voltage. I wouldn't recommend attempting to test amperage.
whats the easiest way to check if theres power going to the fan from the car? I dont know much about currents..
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Old 03-15-2012, 02:14 AM   #7
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Find a volt meter(multi-meter, or whatever you want to call it) and put it on a like 20 volt setting. a car could be at 14 volts or more when running, so a 12v setting would be too low.

Testing the fan with a 12v source would be a good idea, too. Just keep in mind you may need a fairly significant source of energy, like a car battery.
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Old 03-15-2012, 02:32 PM   #8
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i just realized that there is probably no current going through the wires until the car sends it to engage right? Is the only time the aux fan kicks in when the coolant is getting hot?
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Old 03-15-2012, 02:35 PM   #9
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Just wanted to say it would have been better if you bought an electric fan to ditch your aux and mechanical fans. Then tackle the problem you have now.
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Old 03-15-2012, 02:58 PM   #10
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Originally Posted by Bobobo-bo Bo-bobo View Post
i just realized that there is probably no current going through the wires until the car sends it to engage right? Is the only time the aux fan kicks in when the coolant is getting hot?
I have NEVER had my aux fan come on in the winter months. If you want to 'force' a test, take your mechanical fan off and go for a spin. But keep the fan and tools in the trunk just in case. If the needle even moves a hair past 12-o-clock pull over immediately, shut off the engine, and put the mechanical fan on while the heater is running full blast.

But really, should have done an electric fan conversion. I have one sitting in my garage right now. It's going in next week.
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Last edited by deadwood83; 03-15-2012 at 02:59 PM.
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Old 03-15-2012, 10:03 PM   #11
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Just wanted to say it would have been better if you bought an electric fan to ditch your aux and mechanical fans. Then tackle the problem you have now.
i have the stock electrical pusher fan that comes on the manual 323is. if i put anything else in i think it will throw codes. i think i misused the aux term
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Old 03-17-2012, 02:38 AM   #12
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Im trying to find out if theres a way to force the fan on without the needle needing to pass 12 o clock? is the only way to test if the fan works to idle until it gets warm enough for the fan to kick on?

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Old 03-24-2012, 07:43 PM   #13
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What ever happened with your situation? I recently had the same issue and bought my fan from AutohausAZ as well and nearly overheated my car because the fan never spins. I am getting good power to the fan, but it never turns on. I have the suction fan though.
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Old 03-25-2012, 11:48 PM   #14
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