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X3 E83 (2004 - 2010)
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  #1  
Old 04-16-2015, 09:47 AM
kingyuk kingyuk is offline
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Location: Michigan
 
Join Date: Apr 2015
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Mein Auto: X3 E83
Question Overheating in Traffic, it's Fan of Fan switch???

Hi all, I'm new here but already love it a lot!
I got a 2004 X3 E83, it was fine when the weather was cool earlier, but yesterday weather getting warm and when I stuck in traffic, the engine started overheating. But when I get out of traffic and speed up, the overheat gone. I think it might be the electric radiator cooling fan problem. When I got home I did some test. idle and turn on the AC for a while, it start to overheat, and the fan didn't run at all. I thought the Fan must be died, I started checking replacement online. But these morning, when I start the car with the AC on, surprisingly the radiator fan started running with full speed for like 10 seconds and stopped. Seems the fan motor works well. Now I start to think about is any bad temperature sensor cause the fan did not detect the heat and not running? Is it the fan switch?

I'm driving to work today, It's like 70 outside, without traffic, no overheat. But it must be something wrong about the cooling! Please give me some help~


Thank you!
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  #2  
Old 04-16-2015, 01:15 PM
jma1992 jma1992 is offline
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Location: Calgary, AB, Canada
 
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Mein Auto: 2005 X3 3.0i
Air in the cooling system?
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  #3  
Old 04-16-2015, 01:34 PM
Supercourse Supercourse is offline
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Posts: 3,426
Mein Auto: 2004 X3 2.5i
You are on the right track.

Two things trigger the rad. fan - the A/C and the coolant temp. sensor in the lower rad hose.

It is normal for the fan to cycle on briefly upon start up with A/C running. Not exactly sure why. Just initializing things I guess.

The fan motor itself could still be the problem - that is, when triggered to run, the variable speed motor sometimes works and sometimes doesn't.

But the coolant temp. sensor would be a good place to start a process of elimination. Look down on the l.h.s. of the rad and find the hose with a sensor in it.

If it looks like it leaks a bit there, you may as well pull the sensor, test it in the kitchen, and even if it is good you can look into replacing the bad o-ring.

Then next step you would need a scan tool to get some clue as to what in the control circuit is not working.

I think the fan "switch" is integrated into the fan housing so not too easy to troubleshoot without some diagnostics.

Does the heater work well? That can provide a clue on low coolant level or air in the system.
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  #4  
Old 04-16-2015, 07:24 PM
kingyuk kingyuk is offline
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Location: Michigan
 
Join Date: Apr 2015
Posts: 3
Mein Auto: X3 E83
Quote:
Originally Posted by Supercourse View Post
You are on the right track.

Two things trigger the rad. fan - the A/C and the coolant temp. sensor in the lower rad hose.

It is normal for the fan to cycle on briefly upon start up with A/C running. Not exactly sure why. Just initializing things I guess.

The fan motor itself could still be the problem - that is, when triggered to run, the variable speed motor sometimes works and sometimes doesn't.

But the coolant temp. sensor would be a good place to start a process of elimination. Look down on the l.h.s. of the rad and find the hose with a sensor in it.

If it looks like it leaks a bit there, you may as well pull the sensor, test it in the kitchen, and even if it is good you can look into replacing the bad o-ring.

Then next step you would need a scan tool to get some clue as to what in the control circuit is not working.

I think the fan "switch" is integrated into the fan housing so not too easy to troubleshoot without some diagnostics.

Does the heater work well? That can provide a clue on low coolant level or air in the system.

Thank you so much for replying!

Is this the sensor you r talking about?
part#13621433077
http://bmwfans.info/parts-catalog/E8...m_water_hoses/

Seems the heater works ok.

I'm going to check the sensor first.
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  #5  
Old 04-16-2015, 07:33 PM
kingyuk kingyuk is offline
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Location: Michigan
 
Join Date: Apr 2015
Posts: 3
Mein Auto: X3 E83
Quote:
Originally Posted by Supercourse View Post
You are on the right track.

Two things trigger the rad. fan - the A/C and the coolant temp. sensor in the lower rad hose.

It is normal for the fan to cycle on briefly upon start up with A/C running. Not exactly sure why. Just initializing things I guess.

The fan motor itself could still be the problem - that is, when triggered to run, the variable speed motor sometimes works and sometimes doesn't.

But the coolant temp. sensor would be a good place to start a process of elimination. Look down on the l.h.s. of the rad and find the hose with a sensor in it.

If it looks like it leaks a bit there, you may as well pull the sensor, test it in the kitchen, and even if it is good you can look into replacing the bad o-ring.

Then next step you would need a scan tool to get some clue as to what in the control circuit is not working.

I think the fan "switch" is integrated into the fan housing so not too easy to troubleshoot without some diagnostics.

Does the heater work well? That can provide a clue on low coolant level or air in the system.
OK. Just checked it and the sensor is leaking, I can see the wet down there. but I have no idea how the pull that thing out! there is a wire lock on it?
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  #6  
Old 04-16-2015, 08:50 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
 
Join Date: Feb 2008
Posts: 3,426
Mein Auto: 2004 X3 2.5i
Pull wire clip horizontally to unlock electrical connector.

Then squeeze plastic tabs either side of sensor and pull it firmly out.

See: http://www.bimmerfest.com/forums/sho...d.php?t=385920
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