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Often in cars there are a couple resistance wire coils in series with the slower fan speeds, and these resistance wire coils are usually in the air stream inside the air ducts in the dashboard. As they corrode(they are in the airstream) and age sometimes they overheat and burn out and stop the blower from lower speeds. Needs be found and replaced if "Open circuited" A wiring diagram from the manufacturer would reveal. If "blower resistance coils" asked for at autoparts store (used by garage auto repair guys) may have a parts lookup, assembly schematics may show where it is located in the vehicle.
The resister puts current to the motor when you change
speeds on switch so if you motor only work in one or two
speeds you no the resister is bad if you put current direct to
motor make sure. It runs if ok change resister thank you and please reply
I have no experience with the E320 but disassembled several BMW lately. They all had the resistor pack in the airstream close to the blower motor - I think they get pretty hot! It looked like you almost had to remove the entire condenser to get to it. Good Luck!
Blower motor is bad. Resistor controls speed. Motor is so worn out that it will only turn when set on high. Best to replace it before it burns out something else due to the high current draw.
Different speed settings on the blower motor is achieced by using resistors mounted on a circuit board usually fitted in the airstream of the system. For the highest speed setting the blower motor is connected directly to the battery (by way of the switch of course). Lower fan speeds are achieved by lowering the voltage(using a resistor between the battery and fan). These resistors get pretty hot and sometimes burn through thereby not letting power through to the fan motor. The first place to start looking would be under the passenger side dash. Look for a connector plug in the ducting close to the fan motor with at least 3 wires connected to it. On the Silverado for instance it is accessed from below the glovebox, there is a large plastic cover that needs to be removed first. It is fitted to the fan housing.
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