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General E46 Forum
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Old 03-28-2011, 01:58 PM   #1
jr81
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Join Date: Feb 2010
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how to change ECU cooling fan

Hi guys. I posted a while ago about a high pitched whine coming from above the foot rest under the drivers side of the dash and it turns out that it is the ECU cooling fan (post #13 in the link) that draws air from the interior into the ECU compartment in the engine compartment. Has anybody changed this fan and if so is their a DIY/ procedure for it.

Ant help would be appreciated.

http://forum.e46fanatics.com/showthr...+pitched+whine
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Old 03-28-2011, 03:04 PM   #2
OrientBlau
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Here's the Blower with Cover DIY (Cricket sound from under dash) :

http://forum.e46fanatics.com/showpos...6&postcount=13
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Old 03-28-2011, 03:29 PM   #3
jr81
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Thank you. I cannot wait to change this part out.
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Old 03-28-2011, 03:38 PM   #4
eld4au6
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Does it sound like some kind of electronic whine?

Near the headlight switch?

Last edited by eld4au6; 03-28-2011 at 03:39 PM.
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Old 03-28-2011, 04:04 PM   #5
OrientBlau
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Quote:
Originally Posted by eld4au6 View Post
Does it sound like some kind of electronic whine?

Near the headlight switch?

It sounds like crickets or an electronic whine, coming from where your feet are.

Look at the diagram in the link. The fan itself has bearings which get dry or loose and cause the noise.
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Old 04-11-2011, 01:53 PM   #6
jr81
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Changed the blower yesterday after buying it from Tischer. Has made such a difference thank you.
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