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sounds like you have a sticking flap inside the heater/air con unit or a faulty servo motor. the motors are fixed to the side of the unit and are not bad to get to, check them first.
Sounds like driver side blend door is not functioning, either actuator bad or door has broken, remove actuator see if door moves freely, if door moves freely test actuator, leave out and connect wiring, move controls from cold to hot see if actuator moves.
NOTE:
LHD model shown. RHD model similar.
All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing assembly (1). The heating-A/C system combines A/C, heating, and ventilating capabilities in a single HVAC housing mounted within the passenger compartment behind the instrument panel. The HVAC housing assembly includes:
If you have warm air on one side and cool on the other, you've a situation with the vent flaps. But to backflush the core, take both hoses off the core and run a garden hose to the outlet side going towards the water pump. This will flush it.
Don't drive the vehicle in this condition. Interior water leaks can damage vital components such as the ECU. Check the heater matrix, which is situated in the centre of the interior of the car, up behind the dashboard, roughly behind where the stereo is located. It is surrounded by block, plastic shields, which have to be removed to get to it. If this heater matrix is leaking, then you will have to replace it ASAP, or otherwise risk overheating, or flooding expensive and critical components within the vehicle.
If it only leaks with the heater on and air-con off, then the heater matrix is your likely suspect. If you have a leak with the air-con on only, then check your air-conditioning evaporator unit's drain pipe for security and for any blockages.
When you find the fuse if it has blown also check the resistor to control the fan speed. I cant remember if the 1 series has a load resistor multi tap but it may have failed if you use 1 or 2 speed on the fan a lot, max will bypass the load resistor where as 1 will use maximum load and the thermal fuse might have blown. But replace it as caution. In the earlier models it had a block which was nicknamed the hedgehog, a load resistor buried under passenger foot-well up toward the centre, loads of spiky aluminum pegs which cold air blew over to cool it, always packing up in the earlier models £25 from scrap dealer cheap fix compared to the £££££££ BMW dealers rip off. Heater or air con would either not work or blow erratically. Hope this helps
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