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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 > Issue with Coolant



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      07-09-2018, 10:18 AM   #1
bmw335d
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Issue with Coolant

Hey Guys,

On my 335d I notice that the coolant level keeps dropping in the expansion tank. I have to keep topping it up every couple of days.

I don't see any visible leaks any where and the car is running perfectly.

What could be the cause.

No fault codes either.
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      07-09-2018, 11:42 AM   #2
ranthum
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It's either leaking or burning. Leaking is much cheaper. Burning could be EGR cooler if you still have one or head gasket.
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      07-09-2018, 05:16 PM   #3
335dlci
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Pressure test it. You won't have faults.
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      07-12-2018, 12:52 PM   #4
Lovvi
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Is your coolant mixed with some kind of oil in your coolant tank?
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