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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-15-2014, 10:10 PM   #1
Wrench1957
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Join Date: Jul 2014
Location: Fishers, Indiana
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My Ride: 325XI
Transmission cooler lines 325xi

I've read all I can on replacement, bought both have them in place. I found a small o ring on floor where steel lines go into Trans. Did that come off top steel line.if so what seals bottom steel line. No real good break down. Doesn't seem right, any answers, thanks.
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Old 07-15-2014, 10:45 PM   #2
ddaniel1
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If this is a GM transmission there are small orings on both cooling lines where they go into the transmission. What year?
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Old 07-15-2014, 10:47 PM   #3
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One on each hose, Item 11 here:
http://www.realoem.com/bmw/showparts...03&hg=17&fg=05
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Old 07-16-2014, 05:33 AM   #4
Wrench1957
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It's a gm Trans year is 2003 325XI. Thanks I'll get a couple, many places list lines and such, but no mention of orings going on Trans end. Thanks again for your help.
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Old 07-16-2014, 06:41 PM   #5
swordsman11868
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Random musing:

Does the transmission have a fluid pump that circulates the fluid through the cooler lines?

If so, can the pump fail? And if it fails how would we know?

I probably need to think about other things than my auto trans! Lol


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Old 07-16-2014, 09:52 PM   #6
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Yes, it has a pump. It produces over 200 PSI and can empty the transmission very quickly if one of the hoses comes off, the entire transmission runs off of hydraulic pressure, so if the pump goes out, you will have no movement, just like being in neutral. More info on theory in my DIY below.
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