The water drain hoses for the slide/tilt sunroof are partially permanently integrated in the body and cannot be replaced individually.
These water drain hoses can only be completely replaced with extensive body repair work (e. g. after an accident).
An individual solution is required for damage that was not caused by an accident.
BMW X3 Service & Repair Manual > HVAC: Air conditioner refrigerant
1.0 AIR CONDITIONER REFRIGERANT
FREONÂ
The refrigerant Freon R12 is used in most BMW automobiles with an air conditioner up through the 1992
model year. It has a boiling point of -29.8ºC (sea level), at which the refrigerant is transformed from a liquid
into a gaseous state.
This boilin ...