Obviously, you bought your 640i because you knew that you wanted best-in-class service and a trusted brand both rolled up into one automobile. It's not a regular occurrence that you realize that you have to buy a replacement Blower Motor Regulator Resistor to fix your vehicle. You bought your 640i because its a reputation for performance and European styling appealed to your senses; so why would you be okay with anything but the best when it comes to great quality auto parts? Car aficionados know that a reliable name is built into each BMW, and know that only the best repair 640i parts will suffice when repairs are needed.
Multi-speed climate control has been around for decades, and is a convenience we all take for granted. A heater blower resistor gives you the ability to control the level, volume, and speed of the heat and A/C that comes from the vents. Directly connected to your blower switch, your BMW 640i blower motor resistor adds varying amounts of resistance to the circuit that controls the blower motor. When the BMW 640i heater switch is set to "Max", there is less resistance in the circuit so more amps go to the blower. Conversely, at the lowest blower setting the circuit is running high resistance so fewer amps go to the blower motor.
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