Electronic Fan Module & Cooling Fan Fault 9

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HT4100 4.1, 4.5, 4.9 Discussion, Electronic Fan Module & Cooling Fan Fault 9 in Cadillac Engine Discussion; I have a 1987 Cadillac Seville. The radio, dash and other lights flashed, I pulled car over, i had to ...
  1. #1
    wilsonwilson is offline Cadillac Owners Member
    Automobile(s): 1987 Seville
    Join Date
    Oct 2006

    Electronic Fan Module & Cooling Fan Fault 9

    I have a 1987 Cadillac Seville. The radio, dash and other lights flashed, I pulled car over, i had to have it jumped to get a couple blocks home. Alternator went out I found, got a new one. Starts, runs peachy but getting Cooling Fan Fault 9. I've changed one before, they harder to find now. could it be anything other than electronic fan module I can fix myself? Because if anyone needs an expert on ONE particular model, '87' Seville, I'm the one to call -grin

    Already Tried:
    took fan module off inspected visually; checked all fuses in dash, under dash, under hood; haven't checked ground by starter or inline fuses (don't really know where they are)

    How would I check continuity on the electronic fan module? (GM OEM #1641400) module assembly.jpg

    Thanx in advance

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: Electronic Fan Module & Cooling Fan Fault 9

    You don't. You swap it out. They usually fail by not allowing all the fan speeds to work. depending on coolant temp or A/C head pressure the module can power low fan up to a higher fan speed. Most times the higher speed wont work and the code sets. They were used on early Allante's, 87/88 Eldo's as well.

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