Heater fan resistors replacement

The heater fan resistor is located underneath the dashboard in the heater/AC compartment. The resistor enables the heater blower motor to change the speed of the fan. Without this part you will not be able to change the speed of the airflow from the blower motor. It is also possible that the heater motor blower may not work at all. If the resistor has gone bad, it is likely that the fan will work only on the highest speed.

When a heater fan resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.


The air and heating system in your vehicle is a closed system, so it won’t be inspected during servicing and routine maintenance. If no air is coming out of your vents, you may have a problem with the heater blower motor as well as the resistor. Mechanical resistance to the fan (such as when something gets stuck in the fan), can often cause damage to the heater blower motor resistor.

If you notice any part of the air and heating system behaving bizarrely, however, you should always schedule an inspection. If your fan is stuck on high, you likely have a bad heater blower resistor, and should schedule to have it replaced.

Blower resistors are small parts that can become corroded or just burn out, and a new one often costs less than $50. Because they’re usually under the dashboard on the passenger’s side or behind the glove box, near the blower motor, they can be hard to reach if they need to be replaced.

SA1473 Heater resistor is used in A/C vent to adjust the temperature. Brand new resistor fully meet the OE specifications. Built-in circuit protection device ensures an extended service life. Optima replacement just works the same as the original one. It has been carefully researched and compiled to replace each specific application. Compatibility of car Make and Model is as below,

Car make	Car model
Citroen	C2, C3, C5
Peugeot	1007, 207, 406, 607
Renault	Clio III, Grand Scenic, Megane II, Scenic I，Scenic II，Modus， Grand MODUS，TWINGO II
Nissan	Micra，MICRA III，Note（E11）

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