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How To: Blower Motor Resistor

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  • How To: Blower Motor Resistor

    The purpose of this writeup is to provide a pictorial guide for replacing the blower motor resistor pack. It is applicable to all years, both Ford & Mercury. If your fans only work on high, replacing this part will do the trick.

    Parts & Tools Required:

    - Blower Motor Resistor, Part Number: 3M5Z-18591-BA
    - Torx 15 bit

    Procedure:
    1. Move the front passenger seat all the way back for extra working room.
    2. Detach the top clips holding the foot well carpet up against the firewall.
    3. The resistor pack is located on the left side of the foot well, see the below picture for reference.



    4. The resistor pack is mounted to the firewall.
    5. Remove the four-wire plug. The lock tab is on the left side of the plug.
    6. The single T15 screw is at the bottom of the pack.



    7. Replace old with new, and reassemble.
    8. Enjoy a beer and all fan speeds!

    Note: You shouldn't need to hack up the wire harness like mine. When my resistor pack blew, it took the plug with it which meant wiring in a new plug.
    - Dan
    # 471 - 1998 SilFro. ~Natural Aspirations.~
    # 2399 - 1999 Black/Tan. ~Bone Stock DD.~
    2002 Bonneville SSEI ~ L67 rebuild in progress. ~

  • #2
    Just a quick note. I just replaced my resistor pack using the most excellent guide posted here. I do note that the unit installed in my car was white plastic, and does not have a 3M5Z-18591-BA part# stamped on it. I pulled 3 units out of junkers at the Pull-n-Part, from base model contours. Some were white, and one was blue. Tomorrow when I collect my thoughts I will post some pics and open discussion on why this is a really crap design.

    Mad Dog

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    • #3
      very interesting read, I'm going to tackle this in the next few weeks!
      2013 Dodge Dart 1.4T/6mt
      Viper powered project with father
      99SE traded in 04/13

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