When To Consider Replacing Your Vehicle's Blower Motor Resistor

The heat transfer has become one of the essential processes in vehicles. Because the generation of heat is a very common thing in the vehicles and this heat can be both harmful as well as useful too in vehicles depending on the situations. Hence an HVAC system is used. While driving, we need convenience so that the driving would be safe. For that reason, there is more need of having a good HVAC system that function well. This can only be possible if the components of the system are maintained well. One of such components is the blower motor which need repairs in specific time. So here you will know when to replace the blower motor resistor in your car.

The roles of the blower motor and the blower motor resistor in the car

To understand the roles of these parts, you have to know how the HVAC system works. The HVAC system, the work of this system is to transfer the heat from one region to the other. So, at a time it can cool one area and heat up the other. The functions of this system are both heating and cooling of the parts in the car. Basically, this process is more applicable in the cooling system. This system cools the engine by absorbing the heat from the engine by the help of coolant.

This system then it releases the heat away from the engine by the help of blower fans. These fans make the flow of heated air out from the engine bay. The heaters in the cars heat up the cabin by getting the heat from the heated coolant from engines. The blower fan then blows up the air heated by the heat into the cabin. The fan is rotated by the blower motor which is an electrical device. But as per the convenience, the passengers are allowed to adjust the flow of the hot air by changing the speed of the blower motor by a regulator which can be turned to different marks to get a desired type of air flow.

Now question is that what’s the thing that makes a change in the speed of the blower motor. The blower motor cannot change its speed without the help of any other electrical component. That component is the blower motor resistors. These are the resistors; these resistors are like normal resistors used in different electrical circuits. These are connected to the blower motors so that they can block some of the electrical current flowing to the motor. And once the current through the motor is reduced, it starts to rotate slower than before. More the resistance of the resistors connected to the motor, lesser will be the speed of the motor. So, in this way the resistors control the speed of the flow of hot air into the cabin.

Top signs of bad blower motor resistor

The blower motor resistor does not last forever. Like other electrical components, it also becomes faulty. When the blower motor becomes bad, then the car user gets various symptoms and then they can know that it’s the right time to get the motor resistor replaced. A bad blower motor leads to problems for all the passengers in the car. The drivers get distracted by the heat or the chilled air as they cannot able to drive freely and focused. Even the mood of the passengers too goes off and they cannot enjoy the journey.

Here are some common signs which would help you to identify the problem due to bad blower motor resistor.

Fan not working at certain speed setting

If the fan is not working at a certain speed setting, then probably the resistor might have got damaged. The damaged resistor would not allow the fan to work at certain setting.

Fan is only working at the highest speed setting

If the resistor would become bad, then you would be able to run the motor at one, speed, that is the highest speed. Your car would not with speeds that would require more resistance.

Lack of hot air from the vents

If the hot air is not flowing through the vents, then the motor might be not working, probably the resistor has simply damaged.

Fan speed is inconsistent

The inconsistent fan speed is also the result of malfunctioning resistor.

Conclusion

Get your HVAC system inspected and replace the blower motor resistor if found faulty, so that the problem would be fixed.