BMW - A/C or Heater not working? Could Be This Common Issue.
Faulty water valve. Replacement and electronic bleeding instructions. Video is specific for 5 series years 2004-2010. But Any any BMW model with a water/ heater valve can get jammed open or closed. Keep in mind some models do not have a water/heater valve such as some 3 series. If valve jammed open the a/c will blow hot air all the time! If jammed closed you wont have any heater.