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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > 2010 335i xrive trans heat exchanger



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      06-25-2022, 10:23 AM   #1
markevo10
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2010 335i xrive trans heat exchanger

Hello, I own a 2010 bmw 335i xdrive and recently had a coolant leak and made the very stupid mistake of putting stop leak in the cooling system. Now after I drive approx 20-25 miles coolant gets dumped out of the trans heat exchanger. My question is can I flush the heat exchanger or do I need to replace it ?? Thanks.
Mark R

Last edited by markevo10; 06-25-2022 at 10:27 AM.. Reason: need to add my car model
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      06-26-2022, 04:06 AM   #2
flapeo
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Well id probably replace it. Not sure what the inside of those looks like but its probably isn't easy to clean. The part new is 300, or you can buy a aftermarket trans cooler from BMS which is an upgrade that plugs the lines for 399. I would do that if you're going to modify you're car at all. Prolly order some coolant too and do a flush.
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      06-26-2022, 04:32 PM   #3
markevo10
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Thanks for the reply, Yes I think I am going to replace it. But I'd really like to know why it's dumping coolant out of the bottom where the thermostat is.. I just hope the new one isn't going to do that..
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      06-26-2022, 04:49 PM   #4
flapeo
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Did you install an intercooler recently? When I did my intercooler I think I might have moved/messed up the fitting onto the trans heat exchanger. It leaks a bit and I top off my coolant once a month. Not worried because I have a BMS transcooler that ill install when my bumper arrives in a week or so
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      07-04-2022, 05:26 PM   #5
markevo10
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coolant leak

No i'm not doing any upgrades but I did replace the heat exchanger and flush the entire cooling system.. I think the problem is now solved.. Never EVER use stop leak in your BMW's cooling system.. Just fix the leak and bite the bullet..Do it the right way..!!!
Thanks,
Mark
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