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      01-19-2025, 02:29 PM   #82
jgbuddy
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Drives: N55 DCT 135i
Join Date: Dec 2022
Location: Central MA

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Fior anyone else reading this, there is a chance your transmission's heat exchanger thermostat is stuck and causing the transmission to overheat. (although I doubt this was the OP issue since he said it was erratic / happened when cold.) I have been chasing a similar issue for quite some time now and believe I have finally found the solution now that I understand how the cooling system works. The heat exchanger and thermostat are sold under a single part no and it is a pretty straightforward replacement.
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