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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.
nm
Reviewed in Canada on March 10, 2025
did not work
william h crase
Reviewed in the United States on September 4, 2024
It worked
DN
Reviewed in the United States on August 9, 2024
I purchased one of these for my 2007 Silverado. It still had the original one installed which lasted 17 years and 200k miles before finally dying. I installed this new one and it seemed okay at first during a 30 second test in the driveway. On the first drive I realized that it was intermittent with the blower going on and off. I ordered a replacement with the intension of returning the original. I installed the replacement and it was worse than the first one. The blower was constantly going on-off-on-off-on-off from the very first turn of the key. I then went to AutoZone and purchased their Duralast brand. It was $15 more but came with a lifetime warranty. The one from AutoZone works perfectly. These two that I got on Amazon caused me to have to change it 3 times a go through days of discomfort in triple digit heat. Two units failing from the get-go. A complete waste of time.
Alvin H.
Reviewed in the United States on August 1, 2024
Purchased this thinking it would control my new blower motor, had to remove and put the old one back on due to the fact that it was cutting on and off for no apparent reason, need to return for a refund.
Luis Salinas
Reviewed in the United States on July 19, 2024
It only lasted 8 months before i had to replace it again. If you’re in hard times it’s worth it otherwise get oem
Charles C Jones Jr
Reviewed in the United States on February 20, 2024
Quick install and worked great
Brett
Reviewed in the United States on April 6, 2024
This was shipped super fast and worked perfectly
Customer
Reviewed in the United States on June 5, 2023
This failed part on my sons GMC gave him a dead battery the next morning, not knowing when he got out of the car that the fan was still running. Seems this is a common part failure for intermittent fan blower issues. Once replaced with this part, all is working as expexted.
Kirks4
Reviewed in the United States on December 11, 2023
Exactly what I needed to fix my Tahoe
lorne green
Reviewed in Canada on February 3, 2022
It works perfectly
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