BMW X5 Blower Motor Resistor
Common Faults of a Bad Bmw X5 Blower Motor Resistor
A blower motor resistor powers the fan that sends air inside the passenger cabin of a Bmw X5. However, the same resistor commonly experiences problems that require the part to be replaced. If you don't want to ride a Bmw that's either too hot and humid or too cool and chilly, better be sure that its motor resistor is always working. The following are some signs that can help you know if the one in your car is faulty and on its way to failure:
The blower works only on high setting.
With the system plugged and powered, an easy way to test for faulty resistors is by trying to turn on the blower on various settings. You have a bad resistor if the motor doesn't work on the low settings yet comes alive when you switch it to the highest setting possible. The reason behind this is that electricity to the blower only goes through the resistors on low and passes over it on high.
There's electricity flowing around.
Use a 12-volt test light on three main areas to help you isolate the problem to a faulty blower motor resistor. The first is the fuse for the blower motor. After the fuse, unplug and test the motor itself. A positive reading on these two parts tells you that the motor is fine and the problem is somewhere else. Thirdly, test the blower's switch on various positions so that you can check if there's a certain setting wherein there's no current.
Both compressor and climate control work.
You have a bad blower motor resistor if both the compressor and climate control work, but there's no steady stream of air coming out. The vents may feel cool, the computers may be giving you accurate readings, but the blower doesn't seem to work. This happens because the fan isn't dependent on other parts of the climate control system for it to work.
New resistors are constantly damaged and replaced.
Installing a new blower motor resistor usually takes care of the problem. However, if it always recurs and requires you to buy new ones again and again, the cause may be in a faulty electrical system that's simply abusing the fresh part. Check wires, terminals, and other components to prevent back jobs.