Replace an overheated or corroded blower motor speed resistor and the connector that feeds it in one job with the Dorman hvac blower motor resistor kit, part number 973-410. It fits many vehicles, among them the 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy and 2002-2006 Chevrolet Trailblazer EXT. See the "Vehicles it fits" section for the full list.
The blower motor resistor helps set the heating and air conditioning fan speeds by controlling the current sent to the blower motor. This kit supplies a new resistor together with a harness pigtail, so the connector can be replaced at the same time.
- Direct replacement: the resistor and harness kit is designed to directly replace the original equipment on the listed applications.
- Resistor plus pigtail: each kit contains a resistor and a harness pigtail, which Dorman notes is essential for most repairs.
- OE-like performance: made to perform like the original equipment, so HVAC blower operation can return to normal when a failed resistor is the cause.
- Engineering support: backed by Dorman's team of engineers and quality specialists in the USA.
A blower motor resistor may need replacing if the fan runs only on the highest setting, if some fan speeds no longer work, or if the blower won't run at all. Diagnose the cause before replacing, because a blower motor, switch or wiring fault can produce similar symptoms. The "Vehicles it fits" section lists every application.
Interchange: 15-81095
1581095 · 3A1296 · RU1070 · 20299 · 15373437 · 15415789 · 22807121 · 89018439 · 89018604 · 89019100 · RU377 · RU377T · DR755
This part cross-references / interchanges with the following part numbers:
15-81095, 3A1296, RU1070, 20299, 15373437, 15415789, 22807121, 89018439, 89018604, 89019100, RU377, SMP, RU377T, DR755
Frequently Asked Questions
What does a blower motor resistor do?
It helps set the HVAC blower fan speed by controlling the current sent to the blower motor.
What comes in the Dorman blower motor resistor kit 973-410?
Each kit includes a blower motor speed resistor and a harness pigtail, so the wiring connector can be replaced along with the resistor.
Does it fit the 2002-2009 Chevrolet Trailblazer?
Yes. The 973-410 is listed for the 2002-2009 Chevrolet Trailblazer and the 2002-2006 Chevrolet Trailblazer EXT. The "Vehicles it fits" section shows every listed application.
Will it fit a 2002-2009 GMC Envoy?
Yes. The 2002-2009 GMC Envoy is a listed application, and the "Vehicles it fits" section shows the rest.
What are signs of a failing blower motor resistor?
Common signs are a fan that works only on high, missing lower speeds, or no blower operation. Diagnose the cause first, because the motor, switch or wiring can cause similar symptoms.
