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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > 2007 335i Coolant leak by the transmission after changing heater core hoses



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      09-18-2023, 10:36 AM   #1
guerve
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2007 335i Coolant leak by the transmission after changing heater core hoses

Hi all. I've been prepping my car to sell. This past weekend I replaced the heater core hoses, transmission/engine mounts. After reassembly and coolant fill, I noticed the coolant was now leaking from the center of the car. Puzzling since I'm not aware of any coolant lines further back from the engine compartment. I'm guessing that since It required some force to remove the hoses, that I may have stressed the core and cracked something. I'm sure that it is coolant because the fluid was blue. Does anyone have any additional theories/advice? At this point I may have to donate the car instead of selling it.
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      09-19-2023, 12:14 AM   #2
Brandoch
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Quote:
Originally Posted by guerve View Post
Hi all. I've been prepping my car to sell. This past weekend I replaced the heater core hoses, transmission/engine mounts. After reassembly and coolant fill, I noticed the coolant was now leaking from the center of the car. Puzzling since I'm not aware of any coolant lines further back from the engine compartment. I'm guessing that since It required some force to remove the hoses, that I may have stressed the core and cracked something. I'm sure that it is coolant because the fluid was blue. Does anyone have any additional theories/advice? At this point I may have to donate the car instead of selling it.
The HVAC system has a drain right above the transmission. So the heater core or the connections are leaking.
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