BMW F30/F33/F34 water leaks and damp in the boot
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F30 where do the windscreen water channels drain and why must they be cleaned?
The driver's side channel is under the brake booster and the passenger's side channel under the fuse box. Leaves and mud clog them, which lets water collect. The channels are usually cleaned at an inspection service.
F34 GT has water in the tailgate wing tray, where does it come from?
The tray has two drain holes, and they clog easily with leaves from trees. The holes can be cleaned with compressed air from below.
F33 water collects in the rear sides and boot, what to do?
The side drain holes clog over time, and water runs into the rear side and boot. BMW's service bulletin advises drilling 10 mm holes in the sill and the underbody plastic and cleaning them at oil changes. Water can damage the amplifier, so deal with it in good time.
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