My heater doesnt work on my 330 bmw.......

lets start with the basic questions, does your engien run hot have you ever had service work done on the car before, did you get it new or used. you said that nothing blows out does your fan turn on, if yes check the coolent level in the car, if no check the fan fuse then heater on a car runs on the coolent from the engine it is pushed through a small raidator behind the dash to heat the car you need hot coolent a fan to force it into the car and a path for the warm air to travel check these things ask me again and ill see what i can do to help

does the fan work,if not check fuses,or maybe switch,or fan motor which is unlikley,you need some one you know whos handy to at least think about it after looking at it in the flesh