BMW Z4 roof motor getting wet and replacement
Why does the Z4 roof motor get wet and fail?
The roof drain channels get blocked, so water runs onto the motor and the motor rusts. As a symptom, the roof moves slower than before and finally stops working. The channels should be cleaned regularly, for example with a vacuum cleaner or compressed air.
How do you check the Z4 roof drain channels?
Behind the door, at the top, there is an opening through which the channels can be seen. The right-hand channel can be checked with a small flashlight or an endoscope. The left-hand channel has the motor housing on top of it, so it cannot be seen. The openings are also in front of the rear wheels behind a plastic cover.
How do you replace the Z4 roof motor and prevent the moisture fault?
The motor can be replaced from the boot side without removing the soft top. The new motor housing should be sealed carefully from the outside with silicone, because otherwise the fault can return. If the motor is merely rusty, cleaning may get it turning again.