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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Leaking coolant



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      11-10-2018, 06:03 PM   #1
montr
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Leaking coolant

I have been loosing coolant slowly. I removed the belly pan under the engine and I found the leak. It is at the top coupling of "Connector Hose 17-12-7-805-263". The coupling is in front of engine just below the EGR cooler. The hose is #22 in the picture below. Is there an O-ring that can be replaced or I should replace the whole hose?

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      11-11-2018, 11:15 AM   #2
335dlci
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Whole hose. If there is no part number. Then it is most likely not available sep.
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      11-11-2018, 06:33 PM   #3
montr
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Thanks. After all, it is not the coolant hose but the plastic coolant pipe 11537802632.

After cleanup the area and bringing the engine up to operating temperature, I see a leak in the plastic pipe, at the Y, where it goes toward the EGR cooler. I put some epoxy. If the epoxy does not work, I will have to replace the plastic pipe. The plastic and rubber are getting brittle with age.
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      11-12-2018, 07:15 AM   #4
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Quote:
Originally Posted by montr View Post
Thanks. After all, it is not the coolant hose but the plastic coolant pipe 11537802632.

After cleanup the area and bringing the engine up to operating temperature, I see a leak in the plastic pipe, at the Y, where it goes toward the EGR cooler. I put some epoxy. If the epoxy does not work, I will have to replace the plastic pipe. The plastic and rubber are getting brittle with age.
I agree with 335dlci, the whole hose would need to be replaced as there is no o-ring on that connection. The epoxy may work but I think that's a short term solution as it may degrade over time (not to mention the connector may develop a new crack elsewhere). Looks like a new hose is about $70 and certainly worth the investment to avoid issues down the line.
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