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Old 05-10-2012, 09:51 PM   #1
punkdu
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Transmission Cooler Leak?

Hey guys,

Still having a transmission leak and today was able to see the coolant gushing out from underneath the vehicle. I was able to snap a few pictures with my phone. The car is to low for me to get under it while it was leaking but it look like it was coming from the transmission cooler. What do you guys think?
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Old 05-10-2012, 10:24 PM   #2
jr81
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Looks like it's coming from the bottom of the expansion tank to me. Mine leaked from the automatic trans thermostat coupling.
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Old 05-10-2012, 10:56 PM   #3
punkdu
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Well its possible buy I have already replaced the expansion tank. So I dont think so, any good way to check?
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Old 05-11-2012, 01:04 AM   #4
duboy
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Well its possible buy I have already replaced the expansion tank. So I dont think so, any good way to check?
drive it up on some ramps? i think it'll be easy to pick out once you're under there.
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Old 05-11-2012, 10:25 PM   #5
BM-MAN
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I had a similar issue it turned out to be the transcooler was not pushed fully into the radiator. Also check both orings on the transcooler.
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Old 12-09-2012, 11:33 AM   #6
hckyndfw
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Originally Posted by jr81 View Post
Looks like it's coming from the bottom of the expansion tank to me. Mine leaked from the automatic trans thermostat coupling.
jr81,
I've got a slow leak of coolant on my '01 325i which is visible at the trans-engine interface (it leaks onto the rear of the skid bar/reinforcement bar if that gives a better idea) concurrent with a slow drop in the expansion tank level stick. But, I can't for the life of me find the exact origin of the leak . I'm guessing it's the coolant line to the trans at the transmission coupling. Can you give me an idea of where the trans-side coupling is located exactly? Thanks for the help!
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Old 12-09-2012, 11:35 AM   #7
WDE46
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There are O-rings that get old down there. Also, the cooler presses into the expansion tank mounting bracket. You could buy a new one of those. Make you get the automatic one.
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