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The heater fan blower resistor regulates the rate at which the blower blows air into the cabin of the car, in other words it controls the speed of the fan blower motor according.
Over time, it is normal for the heater fan blower resistor to wear out due to extensive use. In some cases, a short circuit can cause the fan to jam at one speed, when the fan is not working at all, a fuse may have blown.
Sometimes a faulty heater fan can also be due to a poor electrical connection, for example due to a connector that was subjected to an excessive amount of heat and subsequently started to melt. In this case, simply replace the connector. With that said, it's important that a problem like this be addressed as quickly as possible to avoid further damage or inconvenience.
If you experience problems with the heater fan resistance, it is recommended that you get it inspected by a qualified technician and, if necessary, replace it. Seeing that the fan is especially prone to wear over time, it should always be repaired as stipulated in the guidelines established by the manufacturer of your car.
The cost of replacing a heater fan resistor depends on make and model of the car. Select your car make and model at the top of the page to find out the exact cost of replacing heater fan resistor on your car.