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HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Brand Information
STETIG
- Provider of HVAC Blower Motor Resistor products to the worldwide OEM market and aftermarket.
- STETIG offers complete HVAC Blower Motor Resistor coverage for Asian, Domestic and European vehicles,
- Top brand awareness and unsurpassed quality.
This bulletin describes common blower motor resistor failures including inspection and testing to ensure proper operation
The STETIG technical services team receives many calls about inoperative blower motors and blower motors that only work on certain speeds. When a blower motor only works on the highest speed most likely the blower motor resistor has failed. A failed resistor will sometimes allow the blower motor to run on the highest speed position because the max speed is not resisted and will have a separate circuit through the resistor. Before replacing the resistor check the circuit fuse and wiring for possible damage. The failure of individual fan speeds may also indicate a failed blower resistor. Be sure to check the wiring and connector for damage first.
A DVOM (digital volt ohm meter) is necessary to test the blower motor circuits. Using a wiring diagram for the vehicle application and the test meter, test each circuit while cycling the fan switch at each of the fan speeds. You should see a change in the activated circuit as you cycle the fan switch. Fan resistors with integrated circuitry and vehicles with automatic climate control will require a more in depth understanding of circuit operation to test.
It is possible in some cases the resistor connector can melt causing the failure, or you may have a situation where the resistor has been replaced recently and failed again. For this situation, the blower motor amperage draw should be tested to verify it has not exceeded the rated amperage specification causing excessive heat leading to melting and failure. For this test you will need to locate the fuse for the blower motor circuit. The vehicle owner’s manual is a good place to find the location and correct rated amperage fuse required. Using a voltmeter and an amperage clamp, install the clamp around the harness leading to the blower motor, this will give you an accurate amperage reading of the blower motor.
With the blower fan running on high speed the percentage should be less than half of the fuse rating. Allow the fan to run for an extended time for this test to allow the motor to reach full operating temperature. If the draw is over half the fuse AMP rating, the blower motor is the likely cause of the resistor failure. Replacement of all failed, damaged, and worn components are required to ensure the blower motor runs properly and to prevent future component failures or damage to the blower motor circuits.
Many trouble codes and electrical problems may lead to the replacement of an electrical connector. This article will guide you through the proper replacement procedure of those electrical connectors.
STETIG offers many aftermarket replacement electrical connectors. We receive numerous questions concerning proper wire orientation. On many of our aftermarket replacement electrical connectors the wire color will may not match the wire color of the connector it is taking the place of. The color of the wire and connector is irrelevant, but the gauge thickness is critical. A smaller gauge wire will not be able to handle the load that a larger gauge wire can and may lead to an overheat condition and possible fire. When installing a new connector, it must be wired in the same manner as the OE connector. To correctly install the new product, cut one wire at a time matching the new connector cavity to the old to ensure the proper circuits are being connected.
In cases that the old connector is damaged to the point that you cannot tell what cavity a certain terminal was originally installed, a factory service manual with connector views or schematics will need to be obtained.
For example, in the picture below the orange wire could be identified as the numbe-r one cavity and should match the location on the new electrical connector.To install the new connector, it is important to cut one wire at a time in a staggered length pattern. The staggered length pattern will allow the wire harness to lay flat and not have a mass of repairs in one area which will allow a cleaner looking repair and prevent possible interference with items around it.
Solder and shrink tube are the best repair choice, but a crimp style butt connector is an acceptable alternative when used with shrink tubing to protect the connection. A wire nut, blade style or scotch lock are never a recommended choice to make a clean permanent connection. Attaching the new connector to the old harness should be done by stripping the insulation away on both wires you will be connecting, this will allow you to use a solder iron and solder to permanently bond the two wires while making a lasting, low resistance connection. Shrink tubing over the newly bonded wires is required to prevent a short circuit and to prevent corrosion. Remember to install the shrink tube before the wires are soldered together.
Dickie Walls
Reviewed in the United States on February 15, 2025
I bought this resistor in June of 24 and installed it. It worked until Feb of 25 and burned out.
Edwin I Guilloty
Reviewed in the United States on September 24, 2024
Buen equipo justo lo que necesitaba gracias
Olalekan Obileye
Reviewed in the United States on May 7, 2024
The product works very well and a perfect fit
pocat
Reviewed in the United States on May 23, 2024
Fast shipping of the correct part. Thank you.
MK & RK
Reviewed in the United States on October 19, 2024
Fits and works as it should. 1996 F-250. Fan speeds 1-3 didn't work after somebody left the key one day but they do now. I gave it a mist of high temp paint for a little protection since the old was very rusty. All happy here. Will update if it fails.
ThornCreek
Reviewed in the United States on January 28, 2024
This fan motor resistor fit my 1992 F-250 perfectly and my fan speed selector works as it should.
yanoss
Reviewed in the United States on September 1, 2023
My blower motor went out on my 1989 Ford F350 with the 5.8 engine. So while I was replacing the blower motor I also replaced the resistor which you should do anyway. It works fine and the price was very good.
James O.
Reviewed in the United States on October 13, 2023
Solved problem temporarily. Still seemed like blower was not 100%. Ordered 4 position fan switch just in case as well. If your vehicle is old like mine. Remove the blower motor and clean the evaporator core and heater core housing. There was enough leaves and dirt in mine. I could’ve grown sprouts in there. You can flush the evaporator core with water, but not the heater core. A day later I was back to almost no speed at all so I replaced the fan motor switch. It had gotten very hot And the plug was very difficult to remove and somewhat falling apart. Obvious heating issues showing on the plug and switch. I save the plug, put in a new switch and that solve the problems.
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