Do you have crickets in your BMW's dashboard? It is more than likely that it is your blower motor. Here at Turner Motorsport, we carry quality OE aftermarket and Genuine BMW parts to help you get the heat fixed in your BMW so that you and your passengers are more comfortable in the cold months.
The blower motor resistor controls the speed of the blower motor - a failed unit can leave you without heat or air conditioning when you really need it.