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Old 06-12-2018, 11:51 AM
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Tranmission Cooler Replacement Question

this question isn't for an X5, but rather e60LCI. The e60 forum isn't as active as this one. which is why i figured i post my question here.

i have a 2009 528i with a hole in the transmission cooler attached to this radiator. i'm planning on changing it this weekend. my question is do i need to add transmission fluid to the transmission after i replaced the cooler?

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thanks,
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Old 06-12-2018, 12:28 PM
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Quote:
Originally Posted by donmayor View Post
this question isn't for an X5, but rather e60LCI. The e60 forum isn't as active as this one. which is why i figured i post my question here.

i have a 2009 528i with a hole in the transmission cooler attached to this radiator. i'm planning on changing it this weekend. my question is do i need to add transmission fluid to the transmission after i replaced the cooler?

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thanks,
I would assume you're going to lose some fluid in process so I would top it off.
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Old 06-12-2018, 04:34 PM
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I agree with smokeyyank, already having a hole and removing and replacing the t-cooler will definitely put you down enough fluid to potentially cause wonkie shifting issues for sure - I would definitely make sure that is topped off.


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Old 06-12-2018, 11:19 PM
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Where is the hole exactly?

I had a hole in the core of my trans cooler on the 3.0i where ATF was leaking into the cooling system. A routine coolant check showed mayo under the reservoir cap. I thought I blew the headgasket or cracked the head but a last ditch check on the ATF cooler via pressure test showed the leak and we started there, lucky it solved it in my case.

If there is crossing over I would change out the coolant and the ATF. Water contamination of the trans fluid has the potential to kill your tranny. Mercedes comes to mind with the W203 C and W211 E's having ATF contamination via the radiator oil cooler that has killed a lot of transmissions.

When I replaced my cooler I replaced coolant and ATF to be safe.
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Old 06-12-2018, 11:34 PM
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Oh, and IIRC the only way to know if you need to add ATF is to open the fill plug and check ATF level there at a certain temp. Anything other than that would be guessing.

Also, I think the trans coolers have o-ring seals that would be a good idea to replace at the same time.
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Old 06-21-2018, 04:08 AM
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Originally Posted by g300d View Post
Also, I think the trans coolers have o-ring seals that would be a good idea to replace at the same time.
Yep, on the X they call them "X-Rings"(2 each needed)
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