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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-05-2014, 06:07 PM   #1
//Maxwelljuppercut
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aux fan-not the normal issue

aux fan does not work.
does not work with ac on.
does not work with coolant temp sensor unplugged.
fuse (50A) is good.
fan is known good,
tried brand new (fan delete) electric fan - no good.
has 12v at the plug.
the only thing i can think of is that the trigger is not being activated.
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Old 06-05-2014, 07:00 PM   #2
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Is the fan switch broken?
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Old 06-05-2014, 09:55 PM   #3
//Maxwelljuppercut
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Quote:
Originally Posted by Bafffyyy View Post
Is the fan switch broken?
where on the car is the fan switch
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Old 06-05-2014, 10:12 PM   #4
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A couple weeks ago my aux fan would not turn off, it was stuck on full speed. My solution was as simple as replacing the fan (thanks lszlszx!). Totally different than your predicament. But....

As I was reading and researching the problem I discovered that the aux fan receives it's commands from several different sources...this info is from a post by user Sansho....

- Coolant outlet temperature (lower radiator hose sensor)
- Calculated (by the ECM) catalyst temperature
- Vehicle speed
- Battery voltage
- Air Conditioning pressure (calculated by IHKA)

The thread is HERE

I'd start be looking into each one systematically.

Good luck...if you figure it out please post up your results.
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Old 06-06-2014, 06:29 PM   #5
//Maxwelljuppercut
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thanks for that, but it doesnt seem to apply to my situation.

anyone else have any ideas?
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Old 06-07-2014, 06:58 AM   #6
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Did you check the voltage at the fan?


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Old 06-07-2014, 09:30 AM   #7
//Maxwelljuppercut
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12v at the plug
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Old 06-07-2014, 10:03 AM   #8
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Did you try applying 12v power from an outside source to verify fan function?
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Old 06-07-2014, 10:13 AM   #9
//Maxwelljuppercut
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yes its not the fan itself
also brand new (fan delete) electric fan inop
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Old 06-08-2014, 12:31 PM   #10
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anybody?
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Old 06-08-2014, 06:36 PM   #11
shanneba
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It is normal to find 12 volts all the time at the fan (even with the engine off), The ECU controls the fan through the third wire.
You might check the power and ground for the output stage from the ECU (No I dont know where exactly)

Here is a link to a BMW electrical diagram site..... have fun!

http://www.bmw-planet.com/diagrams/r.../e46/index.htm


Electric Fan

Under certain operating conditions, the engine control activates the electric fan at various speeds.
The electric fan is activated by means of a power output stage directly on the fan motor. The motor control unit activates this power output stage by means of a square-wave signal with duty factors (variable pulse width) between 10 and 90 % thus controlling the various speeds of the electric fan. Pulse duty factors less than 5 % and greater than 95 % do not trigger activation but rather they are used for fault detection purposes. The power output stage features its own positive and ground supply.
The fan speed is influenced by the coolant temperature at the radiator outlet and the pressure in the air conditioning system. The fan speed is reduced as the vehicle speed increases.
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Old 06-09-2014, 01:20 AM   #12
GMrc51
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I had all the issues you described up top. After topping up freon, everything worked. Now I have a brand new fan, lower hose temp sensor that I didn't need. lol
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Old 06-09-2014, 03:33 PM   #13
ChuckyVee
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Quote:
Originally Posted by //Maxwelljuppercut View Post
thanks for that, but it doesnt seem to apply to my situation.

anyone else have any ideas?

Ok well...the four bullets I listed are what turns the fan on. If your fan is not turning on then I'd suggest looking into each one.

Here the fan inputs again...


- Coolant outlet temperature (lower radiator hose sensor)

- Calculated (by the ECM) catalyst temperature

- Vehicle speed

- Battery voltage

- Air Conditioning pressure (calculated by IHKA)


The last one corresponds to what was posted above with recharging/topping of the AC system.



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