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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 > 2011 bmw n52



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      10-29-2023, 01:20 PM   #1
sanjot147
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2011 bmw n52

My 2011 n52 seems to be making coolant disappear. I have no leaks or anything yet i woke up to an empty coolant tank. I literally just filled her up 2 days ago too. Bleed screw was tightened when I filled the coolant because i heard that could sometimes leak too. Anyone know what the issue could be?
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      10-29-2023, 06:54 PM   #2
Brian86
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Yes.

It's leaking coolant.

Look harder.
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Sometimes a bolt is just a bolt.
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      10-30-2023, 06:31 AM   #3
Efthreeoh
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Pressure test the cooling system
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      10-30-2023, 08:11 AM   #4
TGTIW
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2011 and if it's on original hoses, mickey mouse flange, water pump, etc, it's leaking. The flange has probably mostly dissolved by now and the o-rings in the hose connections have dried and hardened nicely.
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