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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 05-30-2015, 02:35 PM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
Posts: 16
Mein Auto: 750li, 2007
radiator fan issue trouble shooting help please

I've been struggling to solve this one.. and seek help from the community. Here is brief scoop.

2007, 750li, 82K miles.
About a week ago I got a message, "engine temperature high, drive moderately". I immediately turned off the AC and put heat at max. it brought the temperature down and I was able to drive the car home. Tested again and found out that the radiator fan is not running even with AC on and engine hot.. I kept an eye on eng temp from "sensor data" item 5. (after unlocking the data using sum of last 5 digits of VIN)

1. First I changed the sensor in the lower radiator hose.... didn't help
2. Then changed the sensor in the water pump body.... didn't help
3. Then changed the thermostat .... didn't help.
4. Today I changed the fan too.. it wasn't easy job but I managed it..

Seems like the some message to the fan is being interrupted and its not kicking..
From the same push button I get the following fault codes that I'm unable to understand
8E111 20 000 33A8 7B

here are my questions:
1. What is controlling the radiator fan?
2. meaning of the above fault codes?
3. What is the normal operating temp of these cars?

Thanks
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  #2  
Old 05-31-2015, 08:08 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
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Mein Auto: 750li, 2007
Another question:
Should the fan run with simple 12V DC feed to the red wire?
If any one has electrical circuit diagram for the cooling system, I can find my way out...
thanks
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  #3  
Old 06-01-2015, 08:30 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
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Mein Auto: 750li, 2007
Any one with tips for me?
I just ordered Peake tool to read fault codes.. Hope its worth spending $140 on this tool.
thanks
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  #4  
Old 06-01-2015, 11:02 AM
Angelus666 Angelus666 is offline
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Location: France
 
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Posts: 45
Mein Auto: 760LI
Hi,

I had the same issue on my bmw 760. The electric fan was dead. Change it, and problem solved. Normally the fan is control by the dme. The fan has 2 3 gear.
I had on my fan a ground wire issue. When you will have you robd reader, it's will be better to understand the problem.
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  #5  
Old 06-01-2015, 11:12 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
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Mein Auto: 750li, 2007
um....
Mine still didn't work after replacing the fan..
I purchased after market Dorman 621-211
Now I'm waiting for the scanning tool to make any more progress..
thanks
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  #6  
Old 06-03-2015, 06:01 PM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
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Mein Auto: 750li, 2007
Today got my Peake san tool and ran the test.. here is summary:
code: 2EFE e-fan, control
code: 2f17 engine oil temporary too high
code: 2EEA temp sensor coolant exhaust, signal
code: 2d13 luftmassenmesser rational
code: 2f15 vehicle speed, plausibility
code: 2EE0 coolant temp sensor, signal

Okay now I put all on the table.. seems like some errors are being generated after one fault kicked in.. One can think for sure, the fan itself if fine. Something from the above faults in not sending the signal to trigger the fan when needed.. Please note that I have replaced the two sensors+ thermostat. Please review the above and advise...

Last edited by 750-pilot; 06-04-2015 at 06:45 AM.
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  #7  
Old 06-04-2015, 08:23 PM
Meltdown325 Meltdown325 is offline
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Location: Texas
 
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Mein Auto: 750li & E39 M5
Hate to tell you, but It's the Dorman fan. I had the same problem on my 06 750, and changed all of the same parts that you have changed. I installed the Dorman fan, but it just never worked. I spent at least a week checking and rechecking everything, trying to figure out why it wasn't working.

I finally broke down and dropped around $650 on a new BMW OE fan, and it worked immediately. There is a lot of circuitry inside these fans, and the Dorman just doesn't work.

And to answer your other questions, no, you can't make the fan spin by directly sending 12v. There are a million things that the DME analyzes when determining when and how fast to spin the fan. And it runs at infinitely variable speeds, based on the DME signals.

I think the normal operating temp is 100-105.

Last edited by Meltdown325; 06-04-2015 at 08:26 PM. Reason: Added operating temp info
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  #8  
Old 06-04-2015, 08:37 PM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
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Mein Auto: 750li, 2007
Thank you for very valuable feedback..... Frankly, its a shocker that the fan itself is bad and new dorman is worthless. I was thinking about generating a square wave DC pulse the test the original fan and didn't figure out yet.

Since you are so confident about it, I'll take your word and order the OEM fan for $650.

thanks again..
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  #9  
Old 06-04-2015, 09:44 PM
Meltdown325 Meltdown325 is offline
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Location: Texas
 
Join Date: Jun 2015
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Mein Auto: 750li & E39 M5
Hopefully things work out for you. I think the Dorman fan is not compatible with the 06+ e65/66, which have a different cooling fan setup from the early e65/66 cars. I believe it's a communication issue with the DME. I dissected my Dorman fan (since I couldn't return it) and the internals were vastly different from the OE fan.

The BMW part is about 2x the cost, but it is way higher quality.
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  #10  
Old 06-05-2015, 06:33 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
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Mein Auto: 750li, 2007
After getting your previous post last night I went ahead and placed order for new fan from BMW dealer in Atlantic city for $550 (free shipping to MD) I believed that your suspicion about DME communication is correct..
Today I plan on borrowing an oscilloscope to look for square wave at the fan connector.. My voltmeter only showed me flat 12.1 V... This way I can rule out the DME issue, while new fan is being shipped to..
Thank you again Meltdown325..

I'll put the outcome on the list..
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  #11  
Old 06-10-2015, 08:00 PM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
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Mein Auto: 750li, 2007
Final update: Mission success
I got my new fan from BMW dealer delivered today.. Replaced it in a jiffy.. Went in like piece of cake.. Started the engine and Woooha fan kicked in as I pressed AC button, while engine was still cold.. As temp got upto 88 deg fan started even without AC.. So all seems normal. Tomorrow morning I'll be driving my car to work after about 2 weeks gap..

Thank you to Meltdown325 who saved me lot of time by pointing the problem to the dorman fan..

Hope this exercise has been valuable to other readers..

Last edited by 750-pilot; 06-10-2015 at 08:02 PM.
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  #12  
Old 06-11-2015, 06:39 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
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Mein Auto: 750li, 2007
today I drove to work. .Its about 45 min drive in Washington area traffic with mostly stop and go Outside temp 76 deg F.. The coolant temperature varied between 88 degC to 111 deg C.. few times I hit 70mph but temp remained 107 C .

Here is the key question: What is the operating temp of these cars?

I can start another thread with this question to get some help from others..
I'm not sure if the fan is working fine or this temp variation is not normal..
Any insight from any one?
thanks

Last edited by 750-pilot; 06-11-2015 at 06:51 AM.
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  #13  
Old 06-11-2015, 07:38 AM
Angelus666 Angelus666 is offline
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Location: France
 
Join Date: Jul 2014
Posts: 45
Mein Auto: 760LI
Hi,

Yes it's normal. and your radiator fan do the job.
The serie 7 e65/66 warm a lot and i know that the thermost will open at 110c or 105.
If you want to have a lower temperature, you need to change your OEM thermostat to 90C Thermostat :

http://www.bimmerfest.com/forums/sho...d.php?t=716648
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  #14  
Old 06-11-2015, 07:50 AM
750-pilot 750-pilot is offline
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Location: Maryland, USA
 
Join Date: May 2015
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Mein Auto: 750li, 2007
Oh,, I didn't know that.. I got worried when I saw 111 C temp.. Thank you Angelus666, you saved me trip to the stealer..
BTW, I had installed new thermostat, OEM from the dealer. So I guess that is high temp as well.
thank you again..
If any thing changes I'll update the forum.
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