Figure 2 On our 1997 BMW 540 fuse # 28 (green arrow) is the power supply for the blower motor. You should unplug the fuse and see if it is blown. You are going to need to look at a wiring diagram for your specific car to make sure you are checking the right fuse.
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. 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.
The best-selling BMW 3 Series is the 328i base model. The three top problems with this affordable BMW car are as follows: Oil leaks from the lower engine area — reported by over 200 owners. Blower final stage fan resistor failure — reported by more than 100 owners. Outside mirror folding out too far — reported by over 80 owners.
Reasons a Mitsubishi Outlander Heater Isn't Working. Mitsubishi Outlander. The most common reasons a Mitsubishi Outlander heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 %. 31 % of the time it's the.

It sends still-hot coolant back to the engine, causing temperatures to rise as the coolant fails to do its job of cooling down the motor. The cooling fans keep running. Conversely, the cooling fans may keep running even when the engine is offline. This odd behavior indicates a different issue in the relay that controls the fans.

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bmw blower motor resistor symptoms