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      08-06-2020, 01:04 PM   #4
Clearancediver
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Drives: 2004 Z4
Join Date: Oct 2012
Location: Victoria, BC Canada

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Did you change the hose to the expansion tank? Could be that it isn't quite sealing tightly enough. I had leakage from there prior to my changing the expansion tank. Took it off... cleaned the connection of any crud/deposits and then applied a light film of silicone to "grease" the o-rings. Never had a problem with coolant leakage after that.
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