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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-18-2007, 08:06 PM   #1
white46
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DIY on replacing Auxiliary fan?

is there any diy on Auxiliary fan?
i searched around but couldn't find any.

my aux fan is not dying.. it's running forever after car shut off.
and from search, looks like i need to replace Auxiliary fan.

if anybody know, please post links or explain procedure.

thanks in advance.
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Old 07-19-2007, 12:23 AM   #2
berserker
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32 MM thin wrench on the fan clutch nut turn quickly clockwise (towards the dirver side in canada) while at the same time holding the water pump stationary using your method of choice. Lol cant give it all away...

Loosen it off - then remove the mountng bolts seperating the fan from the clutch....

Assembly is reverse

Torque on the fan-to-clutch = 10 Nm

Maybe a couple of squirts of WD-40 a bit beforehand, and a cold beer when you are done.
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Old 07-19-2007, 11:08 AM   #3
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Originally Posted by berserker View Post
32 MM thin wrench on the fan clutch nut turn quickly clockwise (towards the dirver side in canada) while at the same time holding the water pump stationary using your method of choice. Lol cant give it all away...

Loosen it off - then remove the mountng bolts seperating the fan from the clutch....

Assembly is reverse

Torque on the fan-to-clutch = 10 Nm

Maybe a couple of squirts of WD-40 a bit beforehand, and a cold beer when you are done.

Only if the car has an automatic tranny. I think the gent has a manual tranny and an electric aux fan.
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Old 07-19-2007, 11:28 AM   #4
white46
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yeah. i'm looking for any diy or instruction on replacing the electric aux fan.
since my car is 5spd, didn't really understand which fan "berserker" was talking about.
thanks for input though, and sorry for not specifying which fan.
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Old 07-19-2007, 12:14 PM   #5
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Seems that everybody is having this problem within the past few weeks (including me). Replacing the fan should only take about 15 minutes. First, take off the air inlet (4 pop plastic pop rivets), and the straight section and elbow section of the plastic air piping going to the airbox. Now you should see two screws at the top of the fan housing holding it to the chassis. On mine, one was a torx and the other was a phillips, but i think both should be torx. Just remove those, unplug the fan and slide it straight up. Installation of the new one is just as easy, just make sure that the bottom of the fan engages into the little slides so its held in place.
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Old 07-19-2007, 12:44 PM   #6
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thanks for input.
i kinda thought it should slide out.

i need to change mine over this weekend. the fan is constantly running even though car has been shut off.
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Old 07-19-2007, 01:19 PM   #7
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1. Remove the air intake cover thingy (4 pop rivets)
2. Remove the screw on the left and the pop rivet on the left (top on either side)
3. Pull up

ARE you 100% sure that it is the rad fan that is the issue?
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Old 07-19-2007, 02:28 PM   #8
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yes. i'm 100% sure. i checked with my mechanice too.

rad fan is constantly running even after car has been shut off for 5hours. lol

thanks for the help.
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Old 07-19-2007, 02:37 PM   #9
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This should help - http://forum.e46fanatics.com/showthread.php?t=483472

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Old 07-19-2007, 02:45 PM   #10
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thank you boss.
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Old 01-26-2008, 12:57 PM   #11
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How about testing the auxiliary radiator fan.

Do's anybody know how to test the auxiliary radiator fan?
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Old 01-26-2008, 01:19 PM   #12
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Do's anybody know how to test the auxiliary radiator fan?
To test for what? To see if it kicks on? There is a thermo switch on the lower radiator hose that tells the fan to kick on once the coolant reaches a certain temperature this way it cools off the radiator. You can unplug that sensor and jump the 2 wires on the harness side and if the fans resistor is still good it should kick on, if not check your fuses and if those are all good ad still nothing more than likely the resistor to the fan is bad and you could jump the fans motor directly.

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