Symptoms and Reasons behind a Faulty Honda Accord Blower Motor Resistor
Keeping your car's air conditioning and heating fans fully functional is made possible with an efficient blower motor resistor. This part is also responsible for regulating the speed of the fans. So, when this part ages, you may find several fan defects that may range from loss of power to fan speed problems. These fan problems can be irritating if not addressed immediately. So if you think your Honda Accord blower motor resistor is already at the brink of its service life, better perform some troubleshooting. Here are just some of the symptoms that you may encounter with faulty blower motor resistors.
No air moving through the vents
The most common reason behind a blower that fails to move air through the vents is defective circuitry. You see, a blower motor resistor has a small circuit board that can become brittle from constant heating and cooling. So to diagnose, simply check the condition of the circuit board if it is still in good shape or if it is already broken. A damaged circuit board results to resistor failure, which is why the part fails to send power to the blower motor.
Failure to control fan speed
When the blower motor resistor fails, there is a chance that you will lose control of your auto's fan speeds. This defect is primarily a result of coil breakage. See, the blower motor resistor consists of coils relative to the number of fan speeds your vehicle has. These coils are crucial in fan control because they are the ones responsible for creating the resistance needed to control your car's fan speed. So, to troubleshoot, check for broken coils on the blower motor resistor. A broken coil part indicates that the fan will not be able to work on that particular fan speed.
A faulty fuse is the most common culprit behind blower motor resistor power loss. Simply check your service manual for the location of the fuse and test it using a 12-volt test light. Also, make sure that the ignition key is on when testing the part. This will help you tell if the fuse is working by checking if both terminals have power. In case only one of the terminals has power, then this indicates that the fuse needs to be replaced.