To access the windscreen bottle, you have to take off the front wheel, wheelarch and dicconnect filler tube. Using 10 mm socket take off one bolt holding the bottle. To reinstall take off side indicator to make it easy for you.
for E90 model it is normal to have leak when the bottle is full. the water is coming out from breather on top of bottle. but if the fluid is complately drain, then there's something wrong with it.
When you put screenwash in you bmw make sure it's genuine bmw as cheap tesco asda ones can block the windscreen washer tank
The botles to freeze and crack but its more common for headlight washers to leak
How do i take off side indicator off 2006 bmw 318i
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