Repeat failure with blower motor resistor? Here's a permanent solution for an AC/Heater Blower Resistor that Keeps Burning Out? This video can help most cars For example, if, on manual climate control equipped cars, the fan only runs on the highest setting the blower motor resistor pack is the cause. Replacement of the resistor pack is relatively simple. Cars equipped with automatic climate control like my 98 328 are a bit more problematic to troubleshoot but there are usually a few common failure Mazda Mechanic: George H. Good, the violet wire is connected directly to the switch in the high position the switch connects that wire to the black ground wire (at the switch) you can do the same thing if you ground the violet wire at the resistor. If the motor runs on high then the proble is in the switch or its connector. The most common causes for AC fan blower motor not working in BMW 3 Series are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working. 1. The blower final stage unit can fail resulting in a malfunctioning or inoperative blower motor. If you suspect your final stage is failing, look for the following symptoms: Blower motor speed fluctuates from high to low. Blower motor does not turn ON. Blower motor only runs at one speed. The blower motor final stage is located on the right side . Inspect the Connector on Either Side of the Blower Motor Resistor and Blower Motor. Check the wiring harnesses on either side of the resistor and blower motor. If the blower motor has mechanical issues, it could overheat the wiring and cause an issue transferring power. If you find an issue with the resistor, blower motor, or the electrical 4395 posts · Joined 2018. #1 · May 20, 2020. Pretty straightforward question I believe. Symptom is that the AC works fine but at random times when the AC is set to max (not auto, I don't use auto much in S.C. heat) the fan will stop blowing. Goes from high to nothing. Doesn't happen all the time. Shutting the car off and then starting again ONLY ONE SPEED FROM BLOWER MOTOR. One of the most common symptoms of trouble with the blower motor resistor is when the fan gets stuck in one setting. Because the blower motor resistor adjusts the fan speed, the inability to change it can point to problems. If the resistor fails or shorts, the blower motor might remain stuck at a particular Blower Final Stage Fan Resistor May Fail on BMW 528i. Problem Description. blower final stage fan resistor is known to fail. Symptoms are the heater fan speed varies regardless of the setting, the fan will not turn off when the car is switched off, or the fan will not switch on at all. 18 people reported this problem. Disconnect the wire connector from the ballast resistor. Set your multimeter to the resistance (ohms) setting. Place one probe of the multimeter on one of the terminals of the ballast resistor and the other probe on the other terminal. Check the resistance reading on the multimeter.

bmw blower motor resistor symptoms