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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 10-18-2005, 08:40 PM
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Leaking transmission cooler

I removed trans cooler and replaced the two o-rings and that did not stop the leak. I was unable to pinpoint the leak, so I tried the o-rings first. I Pressure tested the cooler to about 20 psi and no leaks. What I'm wondering is what psi the transmission fluid is, in the trans cooler? Maybe I need greater pressure for testing for leaks? Car is 1994 325IC
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#2 (permalink) Old 10-19-2005, 06:39 AM
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thats a very good question, to be honest i have no idea what psi the tranny runs at, but are you sure when you did your rings that there was no cracks on the bottom side of the pan?

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#3 (permalink) Old 10-19-2005, 09:28 AM
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I was able to take a close a the trans cooler and the o-rings are not leaking but I still have a leak somewhere. I believe I'll just have to replace the cooler at this point.
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#4 (permalink) Old 10-19-2005, 11:05 AM
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You should just replace the cooler in its entirety. That system is so prone to cracks... You probably have a couple small ones. It's not too expensive if you DIY and can get the part for manufacturer's...


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