The fan motor is powered via the fan motor resistor, so the motor can be powered in the event of a fault or problem. A de-energized fan motor cannot generate air pressure, so the airless heating and cooling system remains outside the ventilation openings.
The fan resistor is connected in series with the fan. In stop mode, the fan motor is disconnected from the power supply. In high-speed mode, the fan resistor is completely bypassed and the fan is connected directly to the car battery, allowing maximum current through the motor.
If you have a faulty fan motor resistor, there may be little airflow from the vents even when the fan is at full speed. In some cases, the poor resistance of the fan motor can prevent the fan from rotating towards the fan, which will cause the fan to not work at all and prevent air from escaping from the vents.
Connect a wire from the ohmmeter to terminal 1 of the resistor. Connect the other wire to terminal 2 and check the specifications. If this circuit is open and the ohmmeter reads infinity, the fan resistor needs to be replaced. Move the bead from clamp 2 to clamp 3 and check this against specifications.
Symptoms of a bad or incorrect fan heater motor
- Low airflow from the vents. One of the first symptoms of a potential problem with the car heater fan motor is poor airflow from the vents.
- The fan only blows at certain speeds. Another symptom of a bad or failing heater fan motor is a motor that only runs at certain speeds.
- No air from the ventilation slots.
A wire in the left circuit will short resistor 100. All current will bypass the resistor and flow through the short. The voltage across the 100 resistor is zero. So, in general, the hypothesis of a short circuit is created by redesigning the circuit.
It is in the dashboard, often on the other side of the steering wheel or in the engine compartment of the bulkhead. A fan motor resistor or fan motor control module is the part that controls the speed of the fan motor.
The average cost to replace a fan motor resistor ranges from 119 to 161. Labor costs are estimated between 47 and 60, while parts are between 72 and 101. The quote does not include taxes and fees. .
Problems Remove the negative pole from the battery. Find the resistor of the fan motor on the passenger side under the dashboard. Connect the electrical connector to the fan motor resistor. Remove the screws or bolts from the fan motor resistor and remove the resistor. Installation is the opposite of distance.
The fan motor is an electrical component that is part of the vehicle’s heating and air conditioning system. It is responsible for controlling the fan speed of the fan motors. A faulty fan motor resistor can lead to problems with the operation of the entire heating and air conditioning system.
Check the fan motor Check with a voltmeter or ohmmeter whether a fuse has blown. If you find one, replace it. Start the car and see if the fan motor works. If the fuse blows again, check for loose circuits. If the circuits are good but the fan motor continues to ■■■■ fuses, replace the fan motor [source: You Fix Cars].
Set up a digital multimeter for ohms. Enter a range of ohms equal to or greater than the value of the resistor under test. Touch the red lead on one side and the black lead on the other. Opponents have no polarity, so it doesn’t matter which side the red or black wire takes.
The fan motor is powered by a fuse called a relay. If your heater or air conditioner is not blowing air through the vents, it could indicate that the fan motor fuse is probably blown. Although it can be easily replaced, the exact location of the fan fuse can vary from vehicle to vehicle.
In a situation where the engine is not running at any RPM, the most likely causes are power protection, a poor engine ground connection, a poor engine speed control module, or a non-running engine. A failed fan motor is the most unlikely of any system. Start by checking the fan fuse and the HVAC controller fuse.