This Resistor for the Blower Motor is a new, aftermarket replacement part. It is just what you need to bring your heating and A/C blower system back to good working order! On most vehicles it is mounted to the HVAC unit inside the passenger compartment. It can be accessed from the passenger foot well area.


  • New, not remanufactured or rebuilt
  • Direct replacement
  • Replaces dealer part numbers: 3M5Z 18591 BA, 3M5Z18591BA
  • Built to strict quality control standards
  • 100% tested prior to leaving the factory
  • 1 Plug
    • 4 Terminal connection

If you are experiencing intermittent stopping during use or the fan only works in one position this may be your solution!



Our electrical and electronic parts are subject to strict quality control testing.  Once the item has been installed or plugged in, it is no longer eligible for a refund.  The item may be eligible for replacement, only if it is found to have a manufacturing defect. Before purchasing, please ensure proper diagnosis of the failed original part is performed


Left Hand Drive Note:

“All of our auto parts are intended for Left Hand Drive USDM vehicles and might not have been tested on Right Hand Drive platforms. If your vehicle is Right Hand Drive, please do your research prior to making a purchase to ensure the part is correct for your specific vehicle.”

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Removing the Blower Motor Resistor (0:36)
    • Open the glove box
    • Push in the sides of the glove box and pull it down
    • Disconnect the resistor wiring harness
    • Remove the 8mm bolt from the resistor
    • Pull out the resistor
  2. step : Installing the New Blower Motor Resistor (1:25)
    • Put the new resistor into place
    • Insert the 8mm bolt into the new resistor
    • Connect the resistor wiring harness
    • Lift up the glove box, push in the sides, and push it in
    • Close the glove box

Tools needed for replacement:

    Ratchets & Related

  • Ratchet

  • Sockets - Metric

  • 8mm Socket

5.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Blower Motor Resistor for our 2003 Ford Focus
Excellent experience all around! Easy to use website. The part was shipped immediately and was exactly what we'd ordered and worked great when I replaced the old resister with the new one from 1A Auto. Will definitely use them again when the need arises.
October 22, 2017
9 months ago
Blower Motor Resistor
The part was shipped and received in the expected window. Installation was a snap and now the blower motor and AC are back to functioning correctly. It's only been a week, but I'd recommend the product. The video on the website was very helpful in guiding the installation.
July 15, 2017
1 year ago
Easy, affordable fix!
Direct-fit replacement for the original resistor (2000 Ford Focus ZX3). My heater was only working on level 4. I replaced this part, and the heater works great again. (FYI: It's located directly behind the glove box, to the left.)
February 2, 2017
1 year ago
The Blower was easy to install and works great. I would recommend it to anyone who is having blower problems for their Ford Focus.
January 23, 2017
1 year ago
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Vehicle Fit

  • 1997-2000 Ford Contour Blower Motor Resistor
  • 2000-2007 Ford Focus Blower Motor Resistor
  • 2010-2013 Ford Transit Connect Blower Motor Resistor
  • 1999-2002 Mercury Cougar Blower Motor Resistor
  • 1997-2000 Mercury Mystique Blower Motor Resistor

This part replaces:

  • OE # 3M5Z18591BA
  • Dorman 973-012
  • Standard Motor Products RU-427
Part #: 1AHBR00035

How-to Video:

(02:34 min)