DIY: FSU (aka Blower Motor Resistor) replacement pictorial guide. It was my turn to replace the FSU (blower motor resistor). I just got tired of the pulsating pattern of the blower and its shutting off on its own accord. It is especially frustrating in the 100F degrees St. Louis weather.
When replacing your FSU, also consider changing the microfilter and inspecting the blower motor operation (a failing blower motor may be a contributor to premature FSU failure). This is a blower motor resistor made by ACM, an OEM supplier to BMW for many electrical parts. BMW Fitments: 3 Series E46 (99-05) > 320i E46 (99-05) > 323Ci E46 (99-05
The final stage resistor controls the fan rate on your BMW X5 blower motor. A failed resistor is visible when your HVAC unit is stuck on one cycle or one setting. The resistor controls the motors speed on your BMW. The final stage resistor is usually what causes the air to either stop or work intermittently through your vehicles vent.
While the blower motor replacement procedure is a major PITA, one 'can' test the leads from the FSU harness connector pins #5 and #1 which are power and ground respectively to the blower motor. Again, we don't have a circuit diagram, but it has been said that the blower motor takes about 6 amps (variously, depending on the speed)
\nbmw blower motor resistor symptoms
Enter Promo Code: YT10 at our website http://www.bimmermerchant.com10% Discount on all purchases We will show you location and removal of blower motor resist The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater. The blower motor resistor is constantly put under stress which can cause it to eventually fail. So, if you are experiencing these symptoms, your blower motor resistor may be bad or failing: Here are 4 common symptoms of a bad blower motor: Low/no airflow from vents. The classic sign of a bad blower motor is restricted airflow coming from your air vents. If the blower motor is completely bad, then you’ll have no airflow at all. Strange sounds coming from blower. Blower motors can make all kinds of sounds, depending on what the Weak airflow. This is one of the first signs of a bad blower motor that people tend to notice. Your motor will wear out over time—this is just part of the general wear and tear your vehicle experiences. As this happens, it means the motor won’t be able to push as much air through your vehicle’s HVAC system, so you’ll start to notice

The blower motor is an important part of your vehicle’s air-conditioning system. It’s responsible for pushing air into the cabin through the vents. It’s controlled by the fan control switch and blower motor relay, which are responsible for managing the amount of voltage the blower motor receives, allowing it to function at different speeds.

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