loader

Blower Motor Resistors and Kits

New BMR Kits featuring our High-Temp Harnesses

Hi-Temp Blower Motor Resistor Kits

NAPA® Echlin® is proud to offer premium Blower Motor Resistor Kits as a high-quality solution for melted connectors and blower motor resistors. NAPA® Echlin® improved on the OE design to create a connector that will withstand the excessive heat and reduce future failure. Our connectors undergo thermal cycling testing to withstand extreme temperatures to prevent melting. NAPA® Echlin® offers blower motor resistors that are direct-fit replacements and engineered to withstand the high amounts of current that can melt the resistor or connector.

View our NAPA® Echlin: Did You Know? Blower Motor Resistor Kits flyer

  • bmrk_fb_1jpg

    Direct-fit replacement electrically operated resistor that replaces damaged OD units restoring A/C and heater blower motor variable speed control

  • bmrk_fb_2jpg

    Tin-plated steel terminals guarantees maximum contact and excellent fit, form and function

  • bmrk_fb_3jpg

    Made from high quality ceramics with copper electrical connectors to ensure accurate and precise resistance values for long life and high performance

  • bmrk_fb_4jpg

    Thermally protected with on-board fuse

  • bmrk_fb_5jpg

    Our plants are IATF 16949 and ISO 9001 certified which ensures that every part is the right part for the right vehicle

  • bmrk_fb_6jpg

    Precision resistor coils for better fan control

  • bmrk_fb_7jpg

    Kanthal D resistor wire provides longer life span for higher watt resistors

  • bmrk_fb_8jpg

    Undergoes testing with thermal cycling to withstand temperatures ranging from -22°F to 257°F

  • bmrk_fb_9jpg

    TXL copper wiring withstands high electric current to reduce heat-related failure

  • bmrk_fb_10jpg

    High-temp connector withstands extreme temperatures to prevent melting

What do Blower Motor Resistors do?

Blower Motor Resistors control the electrical current flowing from the fan switch to the blower fan, which allows the motorist to set the fan at different speeds. The fan speed can be changed either by switching the blower resistor resistance mechanically, using a rotating lever, or electronically by the air conditioning system.

What are the common causes of failure?

Due to technological advancements on today’s automotive heating and cooling systems, blower motor resistors have high amounts of current running through their connectors. As a result, the current produces heat that can melt the connector and resistor. Worn OE blower motors can create a demand for current that also damages the resistor or module. The excess current melts the wiring and plastic shroud, damaging the interface pins on the controller’s circuit board.

burnt-oe-connector.jpg

Tech Tip

For repairs, use an inductive amp clamp to check that the blower motor current draw is less than 80% of the fuse rating on high. If the current is too high, replace the blower motor. Otherwise, the new resistor will fail too. You should also inspect the mating connector for signs of damage caused by excess heat.

Blower Motor Resistors

On most full-size GM trucks and SUVs from 2001–2007, the blower motor resistor has two common failure modes: water damage and excess heat. The GM vehicles are unable to manage condensation. If the duct is clogged, condensation will collect, creating a pool of water that can seep into, and flood the blower motor  resistor module. Worn OE blower motors can create a demand for current that also damages the module. The excess current melts the wiring and plastic shroud, damaging the interface pins on the controller’s circuit board.

NAPA® Echlin’s BR532 Blower Motor Resistor features several improvements over the OE, including an umbrella cover design that prevents water intrusion and a larger-output power device and upgraded two-ounce copper board that protects against overheating.

Download the PDF

  • blower-motor-resistor-1-1-png

    Larger output power device mounted directly to heat sink improves heat dissipation

  • blower-motor-resistor-2-1-png

    Improved umbrella cover design prevents condensation from entering module

  • blower-motor-resistor-3-2-png

    RTV sealant around heat sink and cover perimeter prevents water intrusion

  • blower-motor-resistor-4-1-png

    Manufactured in the USA

  • blower-motor-resistor-5-1-png

    Upgraded 2 oz. copper board increases conductivity and power dissipation to prevent overheating

  • blower-motor-resistor-6-1-png

    Included wire harness undergoes voltage drop testing to ensure performance

Training

Blower Motor Resistor Replacement Tips

  • maxresdefault

    Blower Motor Resistor Replacement Tips

  • maxresdefault

    Jeep Cherokee Blower Motor Resistor Replacement