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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 in-spection and test-ing 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 high-est speed most likely the blower motor resistor has failed. A failed resistor will sometimes allow the blower motor to run on the high-est 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 te-st the blower motor circuits. Using a wiring diagram for the vehicle application and the te-st meter, te-st 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 te-st.
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 te-sted to verify it has not exceeded the rated amperage specification causing excessive heat leading to melting and failure. For this te-st 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 te-st 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.
We do not offer resistor connectors in this Asin
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.
We do not offer resistor connectors in this Asin
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 above 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.
We do not offer resistor connectors in this Asin
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.Don't using wire nuts, blade or scotch locks for permanent clean connections. 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.
Diego Alejandro Galvan
August 16, 2025
My heat/AC started blowing little to nothing even when set to full speed. So I replaced the original blower motor resistor with this part, and everything is back to normal. Thank you so much!
Jadon taylor
August 16, 2025
Let me tell you now, it is NOT as easy as the people on YouTube make it seem. These cars are old, the rubber might as well be glued on so trying to get the coolant hoses off to get this thing out is a pain. However, if your fan only works on full blast and turns on and off every 5 seconds it is so worth the pain. This part was so much cheaper than anywhere else I looked and so far it is holding up really well.
Roger
July 24, 2025
Works perfectly, direct fit on my 99 Lincoln Cartier.
Forrest J. Hatcher Sr.
June 30, 2025
So far so good.
Paula
June 24, 2025
Part works great, ease to install, just what I needed.
Anthony
June 20, 2025
It works as it should
Rosa Bryant
May 29, 2025
This part was junk, it did not work. The dealership put a new OEM part in and it worked just fine. Save your money and do not buy.
Susan
May 20, 2025
was a little work to replace it on my mercury but works great i now have air. good quality
Abdul Hassan
May 5, 2025
Solved the erratic AC air flow problem. Hope it will last for long.
Diego Alejandro Galvan
March 27, 2025
My heat/AC started blowing little to nothing even when set to full speed. So I replaced the original blower motor resistor with this part, and everything is back to normal. Thank you so much!
Jadon taylor
March 7, 2025
Let me tell you now, it is NOT as easy as the people on YouTube make it seem. These cars are old, the rubber might as well be glued on so trying to get the coolant hoses off to get this thing out is a pain. However, if your fan only works on full blast and turns on and off every 5 seconds it is so worth the pain. This part was so much cheaper than anywhere else I looked and so far it is holding up really well.
Roger
February 19, 2025
Works perfectly, direct fit on my 99 Lincoln Cartier.
Forrest J. Hatcher Sr.
February 1, 2025
So far so good.
Paula
January 4, 2025
Part works great, ease to install, just what I needed.
Anthony
December 20, 2024
It works as it should
Rosa Bryant
December 9, 2024
This part was junk, it did not work. The dealership put a new OEM part in and it worked just fine. Save your money and do not buy.
Susan
December 4, 2024
was a little work to replace it on my mercury but works great i now have air. good quality
Abdul Hassan
December 4, 2024
Solved the erratic AC air flow problem. Hope it will last for long.
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