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Thread: 91 Eldorado ETC Blower Motor Wiring

  1. #1
    houstonvett is offline Cadillac Owners Member
    Automobile(s): 1994 Eldorado Touring Coupe
    Join Date
    Jul 2005
    Posts
    14

    Angry 91 Eldorado ETC Blower Motor Wiring

    Found a 91 ETC Eldorado with 60,000 miles. The CCR system was out and replaced all 4 struts, interior and new paint. The blower control motor switch was bypassed so blower would run high whenever on. Bubba cut out original pigtail with the fuseable links in them. My Alldata wiring diagram leaves a lot to be desired. There are 3 wires in the circuit orange, purple and black. I beleive the black to be ground, but no ground when power probe is used. Can't find another 18 ga orange wire in harness. The orange wire ties into the purple wire in the original pigtail and the purple wire also runs off blower control switch. Any help from the members would be greatly appreaciated want to drive this guy. New to the board and have this posted in Eldorado/Seville forum also. Great board, Thanks, houstonvett


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  3. #2
    91TexasSeville's Avatar
    91TexasSeville is offline Cadillac Owners Connoisseur
    Automobile(s): 2008 SRX-V8, 1991 Eldorado
    Join Date
    Oct 2004
    Location
    Near Houston
    Age
    66
    Posts
    1,543

    Re: 91 Eldorado ETC Blower Motor Wiring

    At the blower control module you should find a 2 pin connection and a 4 pin connection side by side. Only one wire serves the 2 pin connector, and only 3 wires serve the 4 pin connector.

    Standing at the front of the car with the hood open looking at the fan control module from left to right

    left side (passenger in this case) 2 pin connector
    x - red
    x - MT (empty)

    right side (driver side in this case) 4 pin connector

    x-MT......x-purple
    x-black...x-gray/solid black stripe


    Red = from 40A maxi-fuse block in the engine compartment right side to blower power control module left side. [2 pin connector]

    Purple = from ACP Blower speed feeback input to blower power module and fan motor (this wire has a 10A fuse either in glove box, under dash, engine bay right side, or trunk depending on year model of Cadillac. [4 pin connector]

    Gray/Solid black stripe = from ACP variable voltage ouput to blower control module. [4 pin connector]

    Black= chassis ground for motor and blower control module. [4 pin connector]

    Hope this helps!

  4. #3
    Eldorado91 is offline Cadillac Owners Member
    Automobile(s): 91 Eldorado
    Join Date
    Aug 2011
    Location
    Michigan
    Age
    29
    Posts
    2

    Re: 91 Eldorado ETC Blower Motor Wiring

    Do you know about the wires come out of the radiator pump


    91 eldorado 4.9 PFI


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