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BMW 323i Blower Motor Resistor

BMW 323i Blower Motor Resistor: Troubleshooting Tips and Tricks

After a long and tiring day at work, it is comforting to know that you have your BMW 323i to take you home. This is where you can relax as you drive to your destination, while the radio is tuned in to mellow music and the A/C is blasting cold air to keep you cozy. To enjoy this kind of comfortable ride all the time, you need to make sure all parts of your A/C system is up and running in good condition. Simple parts like the blower motor resistor play a crucial role in letting you experience better ride quality. This resistor regulates the voltage sent to the blower motor so that the fan will run efficiently and supply air to your interior at your desired temperature. When your BMW 323i blower motor resistor becomes faulty, your vehicle's heating and A/C system will function poorly, causing the fan to run only at a single speed. In some cases, the fan won't even function at all. Trying to turn the climate control fan knob to your desired speed and temperature won't do the trick. The only thing you can do is to check the blower motor resistor and do some troubleshooting to fix the problem right away. Here are some tips and tricks to help you out:

Stuck at high-speed setting

A fan that operates only at a single speed is a sign of a bad blower motor resistor. Usually, the fan is stuck at a high-speed setting, so you won't be able to switch it to your desired speed and temperature. If you have a faulty blower motor resistor, the gap between the connectors increases, making it extremely difficult for electric current to flow across properly and activate the fan at lower speeds. Testing the resistor for proper function is easy with the help of a digital multi-meter. The readings from the device should match the ohm rating of the resistor; otherwise, replace the resistor to fix the problem.

No power

If your blower motor suddenly stops sending air to your interior, then you need to check on the resistor's circuit board. This part powers the resistor and allows the blower motor to function properly. The heating and cooling process can damage the circuit board over time, causing it to become brittle and eventually break. Inspect the circuit board for signs of damage and get a replacement if necessary.

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  • Top Maintenance Tips for Your BMW 323i Blower Motor Resistor 27 February 2013

    Is your A/C system fan blasting hot and cold air at a steady level? Can you use the fan at varying speeds and at your desired temperature? If you answered no to these two questions, then your blower motor may be at the brink of failure. A malfunctioning blower motor usually has a bad resistor that's causing it to become stuck at a single speed or stop running completely. Replacing the resistor is a way to solve the problem, but you must also perform regular maintenance on this part to prevent the same thing from happening again in the future. If your BMW 323i blower motor resistor is in good shape, then you'll less likely encounter problems such as the ones mentioned above. You'll not only enjoy a more comfortable ride each time you hit the road, but you'll also be spared from costly repair expenses. We've listed a couple of tips to help you maintain the good condition of your blower motor resistor.


    Avoid switching the blower motor control to the lowest setting.


    As much as possible, avoid switching the blower motor control to low-speed setting. This will cause the resistor to fail prematurely due to high resistive load. Low-speed blower motor control setting has maximum resistive load-the highest among all other settings. Each time you switch to low setting, you're putting excessive strain on the resistor. Using low setting frequently will ultimately blow the resistor and cause the blower motor to stop functioning completely. Make it a habit to keep the blower motor control at high or mid-range setting only to prolong the resistor's life.


    Replace a broken circuit board.


    Over time, the constant heating and cooling operation will break the blower resistor's circuit board. A brittle or broken circuit board can affect the resistor's performance and prevent it from activating your blower motor. As a result, the motor won't be able to supply sufficient air to your vehicle's interior. To enjoy better resistor performance and uninterrupted blower motor power, replace a broken circuit board right away.