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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 04-01-2010, 10:37 AM   #1
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Join Date: Oct 2008
Location: Jersey
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My Ride: 2001 330i
New radiator, new fan, what else?

So last week, someone brilliant came to visit the family from about a state away, this brilliant person is a self-titled "Mercedes expert" but has recently switched over to BMW, so he has a BMW-specific carputer he wanted to show me. "let's go check your codes" he says, I was quickly lured in because I had the SES light intermittently (as most of us on the forum tend to ). Hey, what damage can a code-checking computer do anyway? None, the engine doesn't even have to be doing anymore than idling. So we hop in, I'm in the passenger seat, he's in my driver's seat, and we start checking away, one or two codes for something like low compression in my 4th cylinder (changing out my sparkplugs soon) and that was it! I was a happy guy, so he turns the computer to me and says "look at this, it's got engine monitoring!" and points at rpms, then punches the gas to redline for a few seconds untill I heard what could only be described as a building collapsing inside my hood. "oh ****" he says, "****ing BMWs" he says, "i'd never own one of these" he says, then he kills the engine. We open the hood, my engine fan has about one blade left, most of them are now nestled in my radiator. Since stud mechanic does no wrong, he asked if I left something under the hood, then proceeds to tell me it woulda happened anyway. I have to pick up the 400 dollars in damage and am now wondering if something else might be broken. My dad and I checked engine mounts (by jacking up the engine among other things) and they were just fine.

What else could have caused this? Since I took high school physics last year my guess is that it happened because my car was on an incline and when my fan was spinning so fast (the car was in park there was little to no resistance on the fan, or so I'm told) and caught air, the blades flexed and hit something. Has this ever happened to anyone? Sorry if this is a repost I haven't been able to find anything

thanks in advance!!!
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Old 04-01-2010, 11:06 AM   #2
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Join Date: Apr 2008
Location: Oc
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My Ride: e46 330ci
Are your belts fine? maybe loose fan. checking engine codes wouldn't have done anything to cause the fan to split into pieces. I've had cars in an incline and rev like that but never damage the fan and radiator.
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Old 04-01-2010, 11:36 AM   #3
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Location: San Diego
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My Ride: '08 335i RIP'03 330i
Sucks, but sounds like a total fluke. When I Sea Foamed my Engine last week I reved it to 6k in neutral and did not have any issues. Be glad it happened in your driveway and not on the highway...

As long as you're in there you may want to think about replacing the water pump, thermostat+housing, hoses, expansion tank, maybe belts and tensioners/pulleys, etc. You have to consider your mileage and how old the parts are. If you DIY you will save $500 - $1000 in labor.

Look at and and you can get the parts for much less than you think... I got a new BMW OEM water pump with the new style impeller for just $72.78 delivered from AutohousAZ ($92 + shipping from Tischer and $140 from my local Stealership).

Spend the time shopping on-line and look for free shipping... Use to look up all of the correct part numbers and you can seach part websites by the part number too (also google the part number can help).

Check out the DIY's for more about what you should replace and will need...

Last edited by Luky; 04-01-2010 at 11:41 AM.
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Old 04-01-2010, 11:59 AM   #4
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Yeah were doing a diy, the expansion tank and water pump were already replaced a few thousand miles ago, were following one of the diys on here, I am a little worried about hoses and stuff though: were definitely replacing the fan, radiator, and fan housing today, hey at least it's nice out !
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Old 04-01-2010, 09:06 PM   #5
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To all two of you following this, thanks a bunch for your help! Everything is replaced today and works fantastically! Let's hope it stays this way!
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accident, coolant, fan, issue

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