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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old Yesterday, 07:04 PM
cox916 cox916 is online now
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Location: south carolina
 
Join Date: Dec 2014
Posts: 3
Mein Auto: 325i
water pump or fan problem

I am new to the site and looking for some help. I have a 2006 325i. At start up the cooling fan comes on wide open. first thing I thought was bad water pump. I bled the cooling system. The water pump would turn on and off but I have read that it is normal. the car is not running hot. Its only doing it when its cold at start up. I can shut the car off and crank it right back up and everything is fine. The cooling fan is working like it should. If anyone has an idea what could be going on I could really use so help.
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  #2  
Old Yesterday, 07:36 PM
chatoyer78 chatoyer78 is offline
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Location: Canada
 
Join Date: Aug 2013
Posts: 24
Mein Auto: 2011 328i xDrive
Have either your thermostat or the lower coolant sensor (which is also a thermostat, as I'm led to believe) checked. Either will throw codes if faulty, so if you can get your codes read you'll be closer to knowing.
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Old Yesterday, 08:27 PM
cox916 cox916 is online now
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Location: south carolina
 
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I was just in garage messing with it. I cranked it up and sure enough fan came on wide open. So I took the cap off of the expansion tank to see what the water pump was doing.It is turning on and off just like bleeding the cooling system. I turned the car off and restarted it. checked the pump again and it was pumping dead ahead. It was not cycling on and off. The water pump cycling on and off when cold must be sending a code like its running hot. But im guessing. Just going to have to take to the shop. Thanks for replying.
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  #4  
Old Yesterday, 09:06 PM
fdriller9 fdriller9 is offline
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Mein Auto: '06 AW 330xi
It's a sign of failure when the pump is intermittent.

If you scan the DME, there will most likely be a shadow fault stored indicating a deviation in pump speed. This fault means the pump is failing. Replace it along with the Tstat.
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  #5  
Old Today, 05:05 AM
CALWATERBOY DUE's Avatar
CALWATERBOY DUE CALWATERBOY DUE is offline
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Mein Auto: 09 E93 335i somewhat mod
Quote:
Originally Posted by cox916 View Post
I was just in garage messing with it. I cranked it up and sure enough fan came on wide open. So I took the cap off of the expansion tank to see what the water pump was doing.It is turning on and off just like bleeding the cooling system. I turned the car off and restarted it. checked the pump again and it was pumping dead ahead. It was not cycling on and off. The water pump cycling on and off when cold must be sending a code like its running hot. But im guessing. Just going to have to take to the shop. Thanks for replying.

You've been reading so must have seen your ride's behavior diagnosed as above many times.

One and a-Two



Last edited by CALWATERBOY DUE; Today at 05:07 AM.
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