The Honda Civic is a popular small car all around the world due to its reliability and build quality.
However, as they age, the vehicles can develop problems with their aircon. One of the more common problems is the fan not turning on.
If the blower motor in your Honda Civic is not working, it might be due to a blown fuse. The blower motor relies on a specific fuse for electrical power. Checking the fuse box and replacing any blown fuse associated with the blower motor can often restore its function.
Another reason could be a faulty blower motor resistor. This component controls the speed of the blower motor. If it fails, the blower motor might not work at all. Replacing the blower motor resistor can resolve this issue, similar to changing the batteries in a remote to get it working again.
Lastly, the blower motor itself could be the culprit. Over time, it can wear out or seize due to debris accumulation or electrical faults. In this case, the solution is to replace the blower motor. It’s a more involved repair, akin to replacing a worn-out heart in a machine, but it will breathe new life into your car’s HVAC system, ensuring you stay cool in the summer and warm in the winter.
As the vehicle ages, the blower motor wears out. This is made worse by dust and debris that gets caught in the fan. The additional heat that is created from the extra resistance will eventually burn out the motor. If the fuse has not blown and the motor refuses to turn on, it is likely that the motor is burnt out and needs replacement.
The electrical system makes use of relays to reduce the amount of current running through the switches on your dashboard. When you turn the air conditioner on, the switch activates the relay, which in turn makes the electrical connection live.
Relays wear out and when they do, the switch will not work. You need to remove and test the aircon relay to see if it is working. A reading of 50 to 120 ohms is the usual operating range. If your multimeter returns a reading outside of these resistance readings, then your relay is bad and must be replaced.
It is less likely that your control module will fail, but this is something to bear in mind if you cannot trace the problem.
In older cars, the wiring becomes brittle and cracks. The insulation can also wear through as a result of rubbing on sharp metal surfaces.
Honda Civic Blower Motor Noise (Steps to Troubleshoot)
Fan noises can become worse over time and are an indication that something may be about to fail.
If you ignore them, they will not go away and you’ll just become progressively more irritated as it gets louder and louder.
To troubleshoot a Honda Civic blower motor noise, you must first remove the cover panel underneath the dashboard on the passenger side of the cabin. Then unclip the power cord and remove the bolts holding the blower in place. Remove any debris inside the fan assembly and vacuum the ducting.
After cleaning the fan blades and removing any twigs and leaves, you may find in the unit, reinsert the blower and connect the power cable.
Switch the fan on and listen for any noises to see if you have fixed the problem.
If the fan still makes a noise, then replacing it with a new blower will likely fix the problem.
Don’t forget to vacuum the ducting to remove any debris that may be stuck inside before replacing the motor.
If your Honda Civic is an older model that doesn’t have filters in place to prevent debris from entering the system, then you should check the intakes under the hood.
You’ll find that twigs and leaves will collect around the air intakes at the base of the windscreen. This is especially prevalent if you live in an area with lots of trees or park under or close to trees.
The leaves and twigs that collect on the windscreen will slide down onto the plastic air intake ducting and eventually work their way inside. The airflow will then pull them down inside the car to eventually end up in the fan assembly.
To prevent the vegetation from getting into the car’s fresh air system, make a point of regularly cleaning the air intake grills so that there is no chance for the debris to work its way inside.
Honda Civic Blower Motor Resistor Problem (Steps to Troubleshoot)
Older Honda Civics are known to develop blower fan problems.
What at first appears to be a big problem is actually quite easy to fix.
If your Honda Civic blower refuses to work properly when pushing the control lever across, it is an indication that the resistor is faulty. The lower speeds will not work and the fan will only turn slowly when selecting higher fan speeds. To fix it, replace the resistor located behind the glove box.
The fan speed control lever is connected to the resistor that controls the fan speed.
On older Honda Civics, this resistor wears out and needs replacement. To access the resistor, you must either remove the glovebox on older models or locate the resistor next to the blower motor on newer models.
To remove the glovebox, squeeze the sides together at the hinges. This allows the glovebox to drop out.
Don’t forget to empty the glovebox before removing it.
On newer Honda Civic models, the resistor is located close to the blower motor and is identified by the four wires in the plug.
Once the glovebox is out of the way, you’ll see the resistor on the right-hand side, held in place by two Phillips screws. Undo the screws and pull the resistor out of the recess. The resistor is similarly held in place by two screws on the newer models.
Copyright protected article by Know My Auto and was first published on Aug 20, 2022. .
Unplug the connector and replace the resistor with one of the same specifications.
Honda Civic Blower Motor Resistor Test (Steps to Troubleshoot)
The blower motor resistor is the component that controls the speed of your fan.
Over time, the resistor wears out and your fan speed will not correspond to the settings on the fan speed lever or dial.
Before replacing it, test your Honda Civic blower motor resistor is the reason the fan is not working properly. To do this remove the resistor and test it with a multimeter. Each pin on the resistor has a specified resistance. Use a multimeter to check the ohm reading on each pin.
The first indication that the blower motor resistor is at fault is that the fan will only work at the highest fan setting or not at all. When you select the first 2 or 3 fan speed settings, the fan will not respond.
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The lowest fan speeds correspond to the highest resistance. If the resistor has failed, the current passing through the circuit will not be reduced and the fan will operate only on the highest current setting. This corresponds to the fastest fan speed.
The first step is to check that the fan is receiving a full 12 volts from the power connection. If it is, then you can move on to checking the blower motor resistor.
Using the wiring diagram, check each of the pins on the resistor for its correct ohm reading. The setting one pin will have the highest resistance, with the resistance getting progressively less on each subsequent pin. This makes sense, as the motor will need a progressively higher current to turn faster.
If the reading is zero or unlimited, then the resistor is dead and must be replaced.
You can either replace the whole unit or you can repair the blower resistor yourself.
To repair the resistor, remove the resistor’s cover to reveal the 4 pins mounted on the circuit board. Then test across the resistor ends where they pass through the circuit board, to confirm that it is faulty.
Then solder a 1-ohm resistor across the contacts to restore the blower resistor to operation. Replace the cover and fit it in the car.
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KnowMyAuto is the sole owner of this article was published on Aug 20, 2022 and last updated on .