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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 12-28-2012, 09:09 AM
deiontroy deiontroy is offline
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Location: houston, tx
 
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Mein Auto: bmw 750li
My cooling fan is running loud on 06 750 li.

06 750li cooling fan is running really loud. At cold start in the morning it comes on and runs really loud. It has never sounded this loud. It runs constant. I don't have a clutch fan, it electric. It doesn't sound like its bad( loud whining ) I checked and nothing is rubbing. Any ideas on what to check and do from here?
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  #2  
Old 12-28-2012, 09:47 AM
seehack seehack is offline
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Location: CA
 
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Mein Auto: 2015 650 Grand Coupe
If you mean the cooling fan in the radiator area, it could be your water pump. I had the same problem almost a year ago and the dealer replace the water pump and the problem away.
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  #3  
Old 12-28-2012, 09:54 AM
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alpinaman24 alpinaman24 is offline
what amg?
Location: San fern valley
 
Join Date: Feb 2012
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Mein Auto: 07 B7,91 735i , 91e30sold
even if the check engine isnt on if you use a moderate bmw scan tool you will see a code
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  #4  
Old 12-28-2012, 10:31 AM
deiontroy deiontroy is offline
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Location: houston, tx
 
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Ok thx. I just changed the water pump 4 weeks ago. Could the thermostat cause that also.
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  #5  
Old 12-28-2012, 12:17 PM
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B7M4W5 B7M4W5 is offline
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Location: CALIFORNIA
 
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Mein Auto: BMW 745LI
Just wondering, you said it sound lound in the morning start is that the only time you hear it cause if u say yes then its not your fan it's your secondery air pump or fan it's under your air filter box and it sounds loud at first start of the day.
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  #6  
Old 12-28-2012, 01:39 PM
deiontroy deiontroy is offline
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Location: houston, tx
 
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It sounds loud first thing in the morning and it stays that way all day long. I know it shouldn't come on in the morning because the car isn't hot.
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  #7  
Old 12-28-2012, 01:44 PM
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B7M4W5 B7M4W5 is offline
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Dam then it could be goin, you may need to replace fan.
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E66 745LI 2004 Sport / Sterling Grey Ext. Blck Int./
22" Wheels / ACS Pedals / ACS Rug Plates/
Black Out Tail Lights / Carbon Fiber Blck.-Gry. Emblams/
Grill Chrome-Blck. /
12" Subwoofers 2000 watt Amp
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  #8  
Old 12-28-2012, 01:45 PM
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alpinaman24 alpinaman24 is offline
what amg?
Location: San fern valley
 
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Mein Auto: 07 B7,91 735i , 91e30sold
dont replace the fan first

other things such as water pump and thermostat control the fan
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  #9  
Old 12-28-2012, 01:58 PM
deiontroy deiontroy is offline
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Location: houston, tx
 
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Mein Auto: bmw 750li
I was thinking it my be the thermostat because I didn't change it when I change the water pump. I will try changing it first.
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  #10  
Old 12-31-2012, 02:01 PM
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alpinaman24 alpinaman24 is offline
what amg?
Location: San fern valley
 
Join Date: Feb 2012
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Mein Auto: 07 B7,91 735i , 91e30sold
yes the thermostat can cause the fan to just go full blast

replace the thermostat then im sure youll have no more issues
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  #11  
Old 06-15-2014, 06:55 AM
Len1975 Len1975 is offline
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Location: Philadelphia, PA
 
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Mein Auto: 2005 X3 3.0
I have the same problem and took it to BMW and they scanned it and no codes came up on it. They said there is nothing wrong, but I know there is because my car's cooling fan never sound this loud before. My temperature gauge is at normal and does not indicate over heating. Someone help me please, its embarrassing driving a BMW that sound like a School bus truck!
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  #12  
Old 09-04-2015, 09:07 PM
Ru-nutty Ru-nutty is offline
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Location: San Diego, CA
 
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Mein Auto: 2006 BMW 750LI
Any updates or solutions for this problem? I'm having a similar issue with my E66. Cooling fan kicks on and goes on full blast once the engine is on. Changed the lower radiator hose sensor, sensor at the water pump, thermostat and disconnected the battery to see if it'll reset but no luck. Only thing to check now is the water pump and fan.
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  #13  
Old 09-04-2015, 10:56 PM
Len1975 Len1975 is offline
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Location: Philadelphia, PA
 
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Mein Auto: 2005 X3 3.0
Hey thanks for getting back to me. I've actually got a new bmw now!
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  #14  
Old 11-19-2015, 01:01 PM
hmqva hmqva is offline
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Location: Virginia
 
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Mein Auto: 2003 525i and 2004 745li
Hi Ru-nutty have you fixed your BMW that had the loud Fan ? I am having the same problem with my 2004 745li please let me know what you did to fix the issue.
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  #15  
Old 11-20-2015, 09:32 PM
Ru-nutty Ru-nutty is offline
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Location: San Diego, CA
 
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Mein Auto: 2006 BMW 750LI
I replaced the temp. sensor at the lower radiator hose, the temp. sensor at the water pump and the thermostat. After all that, the fan would still kick on full blast and then decided to just drive it to a BMW specialist shop. He resetted the system with his computer and the fan problem went away. I unplugged the fan and was driving it like that for a couple of days before taking it to the shop...
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  #16  
Old 11-22-2015, 12:26 PM
hmqva hmqva is offline
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Location: Virginia
 
Join Date: Apr 2013
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Mein Auto: 2003 525i and 2004 745li
Thank you for the replay. I also changed all of those parts in my car and the Fan still comes on in the morning. You mentioned the that the BMW shop reset the software? did they give you more information as to what did they reset ?
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  #17  
Old 11-23-2015, 12:37 PM
Ru-nutty Ru-nutty is offline
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Location: San Diego, CA
 
Join Date: Aug 2015
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Mein Auto: 2006 BMW 750LI
He said he reset all the codes, and to see if they would pop up again but they didn't. The weird thing was that the fan wasn't acting up by the time I got to the mechanic. It was on, but wasn't as loud as it was before. If resetting the codes doesn't work for you, then it's probably you relay in the fan. Bad part is that you have to replace the whole fan itself...
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  #18  
Old 11-23-2015, 05:52 PM
hmqva hmqva is offline
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Location: Virginia
 
Join Date: Apr 2013
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Mein Auto: 2003 525i and 2004 745li
I dropped the car off with a mechanic today, waiting on them to get back to me and tell me what is wrong.
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  #19  
Old 11-24-2015, 02:29 PM
Ru-nutty Ru-nutty is offline
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Location: San Diego, CA
 
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Mein Auto: 2006 BMW 750LI
Nice, yea keep me updated as well. Hopefully nothing too major...
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  #20  
Old 11-25-2015, 05:47 AM
hmqva hmqva is offline
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Location: Virginia
 
Join Date: Apr 2013
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Mein Auto: 2003 525i and 2004 745li
Here is an update for someone else with the similar issue. Picked up the car yesterday, mechanic said it was the A/C high pressure switch that was reading -3 Volt According to him there shouldn't be any reading while the car is off. He replaced the Switch and replaced the lost Freon. So far the car is running fine.
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  #21  
Old 11-26-2015, 08:08 AM
Ru-nutty Ru-nutty is offline
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Location: San Diego, CA
 
Join Date: Aug 2015
Posts: 16
Mein Auto: 2006 BMW 750LI
Do you know where this high pressure switch for the AC is located?
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