since the author has e93 335 in his avatar info then he should check modules in trunk which can be damaged by water since roof can be not fully tight or it's drain clogged with leafs
or this can be engine electic water pump
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E81 2007 130i 6cylinder Montego blue
Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
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