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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 09-25-2014, 09:41 AM
stevejorgensen stevejorgensen is offline
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Location: FL
 
Join Date: Nov 2011
Posts: 8
Mein Auto: 2005 745i
Tranny fluid in radiator and vice versa

Just had transmission rebuild on my 2005 745i. 1 month later discovered transmission fluid in radiator. Replaced transmission cooler and took back to rebuild trans again. Shop said probably need to replace radiator also. Anyone experienced this problem? Thanks
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Old 09-25-2014, 05:34 PM
grayautomotive grayautomotive is offline
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Location: high point,nc
 
Join Date: Jul 2014
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Mein Auto: 745li
Not Radiator is the transmission intercooler that's bad that antifreeze flows into to keep your transmission fluid cool. ITs bad.. Need to replace it
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Old 09-25-2014, 06:49 PM
stevejorgensen stevejorgensen is offline
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Location: FL
 
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Mein Auto: 2005 745i
Thanks. I already replaced it, but was going to have the transmission rebuilt (again) as I assumed if trans fluid was in the radiator, that radiator fluid was also in the trans. Got a local BMW tech to tell me that the trans pressure is higher that radiator pressure, so not much chance of radiator fluid in trans. Dodged a big bullet. Thanks again.
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Old 09-25-2014, 11:53 PM
grayautomotive grayautomotive is offline
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Location: high point,nc
 
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Mein Auto: 745li
no it can happen when the car isn't running but that's the case on many cars its just only when the car isn't running and cut off you could have antifreeze leak into your transmission now for having it rebuilt. I would just have it flushed and filter changed that's all to be on the safe side only but if u having tranny issues u know u having them.
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