Find your BMW heating and air conditioning components here. If your BMW's HVAC system has gone haywire it may be one or several of the products in this category. A/C blow warm or heater blowing cold are all symptoms of a climate control system on the fritz. A fan that only works on one speed is the victim of a failed blower resistor or final stage unit. BimmerWorld has all of the major A/C and heater components for your BMW - microfilter, blower motor, final stage resitor, heater core, control panels, and more.