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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 02-06-2016, 02:32 PM
Jat007 Jat007 is online now
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Mein Auto: 325i, 328ci, X3
Coolant leak in 04' X3 2.5

Hi guys,

I got this small drips of coolant leak in my 04' X3 2.5 w/96K miles. As far as I can see, the leakage is coming out and drips right at the end of the aluminum cooling fins that has two (2) high pressure hoses going into. The leakage is on the driver side of the radiator and it goes straight down to the splash pan. Could this be the expansion tank o-ring to the radiator?

Please help.

Thanks,

Jay
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  #2  
Old 02-06-2016, 02:38 PM
dukedkt442 dukedkt442 is offline
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That, or more likely, the tank itself has cracked. Search "expansion tank leak" and you'll return hundreds of hits.
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  #3  
Old 02-06-2016, 03:53 PM
x3brian x3brian is offline
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Coolant leak in 04' X3 2.5

+1

Your tank is probably cracked and looks like this....

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Note the crack from top to bottom on the right of the label...
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  #4  
Old 02-07-2016, 12:58 AM
Jat007 Jat007 is online now
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Replacing the expansion tank is a lot of work? What else do I need to buy besides the expansion tank, expansion tank cap, and the coolant level sensor?

Thank you guys!!
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  #5  
Old 02-07-2016, 10:47 AM
Supercourse Supercourse is online now
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Mein Auto: 2004 X3 2.5i
AT thermostat.

Not a lot of work to do ET but pulling old one off can be tricky and the AT thermostat may not survive the fight.
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  #6  
Old 02-07-2016, 11:24 AM
x3brian x3brian is offline
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Coolant leak in 04' X3 2.5

+1 on at thermostat

You should be able to reuse the level sensor but your odds are better of winning the power ball than not damaging the at thermostat. Also, the expansion tank I got at Napa came with a new cap. YMMV...not all tanks come with it.

It's a pretty basic r&r. Remove electric fan and the remove clips and hoses. On the n52 there is a bleeding procedure to follow for the electric pump. Since your car is an 04 to 06 never mind as you still have a mechanical water pump.

Last edited by x3brian; 02-07-2016 at 12:18 PM.
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  #7  
Old 02-07-2016, 01:12 PM
Jat007 Jat007 is online now
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Mein Auto: 325i, 328ci, X3
Thank you guys!! I have done R&R on the 92' e36 expansion tank once many moons ago and that the e36 doesn't have the AT Thermostat. It did took me a few tries on bleeding though.

Do you have some instructions for the AT Thermostat removal?

Again, many thanks!!

Jay
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  #8  
Old 02-07-2016, 02:58 PM
swampX3 swampX3 is offline
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good links




http://blog.bavauto.com/10737/bmw-m5...-to-e46-x3-x5/



Last edited by swampX3; 02-07-2016 at 03:00 PM.
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  #9  
Old 02-07-2016, 06:31 PM
Jat007 Jat007 is online now
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Thank you guys!!

Jay
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  #10  
Old Yesterday, 05:09 AM
BMWaufKS BMWaufKS is offline
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Mein Auto: 2008 X3
Thanks from me too -- didn't know yet that I'll likely need the transmission cooler t-stat. That thing's not cheap, but is on order now.

Parts have arrived to do the trans fluid and filter, and I'm hunting for the differentials' gear oil locally, so I think I'll do those first. Waiting for the transfer case fluid to arrive.

P.S. That second video's guy needs a stint at a finishing school.
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  #11  
Old Yesterday, 05:15 AM
abscate abscate is offline
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Mein Auto: 2006 BMW X3... VOLVO... V
My AT thermostat was broken but JB weld fixed it really nicely.
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