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I'm having this problem with my 430i. Pressure tested by pumping up to 15 psi and let it sit overnight, by the next morning it had gone down to 14 psi. No leaks (or smells) detected on the ground. Will have to check the bottom of the water pump.
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2005 M3c, 2016 Z4, 2022 i4 e40, 2024 i5 e40
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