Mark VIII cooling fan swap
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  • 1 Post By cadillac kevin
RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Mark VIII cooling fan swap in Past Cadillac Vehicle Discussion; I want to put a Lincoln Mark VIII fan in my 79 to see if I can gain 1 or ...
  1. #1
    ferrisworld is offline Cadillac Owners Fanatic
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    Mark VIII cooling fan swap

    I want to put a Lincoln Mark VIII fan in my 79 to see if I can gain 1 or 2 mpg. Been reading guides and threads and it looks like it would work well enough. Every mpg counts and my main goal right now is to get to 20 mpg. Best so far is 16 with most of that tank being from Sacramento to San Francisco and back, and the rest commuting to work 20 minutes of highway between Sacramento and Roseville.

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  3. #2
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
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    Re: Mark VIII Fan

    From the thread title I thought this was someone from the Lincoln forum here to flame us!

  4. #3
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Cool....I've seen guys do it in B-body impalas and caprices, but I've never seen it done in an old caddy.

  5. #4
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: Mark VIII Fan

    Why not use the GM stuff that is drop in for the car? The dual electrics used on the 93 FW, or the dual setup on the 94-96 LT1 non trailer pack cars?

  6. #5
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by jayoldschool View Post
    Why not use the GM stuff that is drop in for the car? The dual electrics used on the 93 FW, or the dual setup on the 94-96 LT1 non trailer pack cars?
    I think it is due to the "high flow" of the mark VIII fan. Although, obviously the GM fans flow good enough to keep the LT1 cool.

  7. #6
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: Mark VIII cooling fan swap

    Hadn't thought of that. Didn't realize they came with that. You think it would be good enough? I've just read that the Taurus and Mark VIII fans were the best ones according to some threads. Would be nice to just drop something in though. I imagine the LT-1 Caprices and Roadmasters would have the same thing.

  8. #7
    Fleetwood472 is offline Cadillac Owners Fanatic
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    Re: Mark VIII cooling fan swap

    I'm a huge GM guy but so far nothing beats the Mark VIII fan. That has been used on a ton custom applications and the strongest of what is currently out there.

  9. #8
    caddy1983 is offline Cadillac Owners Fanatic
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    Re: Mark VIII cooling fan swap

    what year of Mark VIII? I have an 83 2 door brougham 4.1L V8 and was thinking of doing this conversion. I have a 96 impala ss with 2 fans and 160
    thermostat and pcm flash by pcmforless.com does anyone have a write up for this conversion? How would I go about having my fans turn on at a
    certain degree?

  10. #9
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by caddy1983 View Post
    what year of Mark VIII? I have an 83 2 door brougham 4.1L V8 and was thinking of doing this conversion. I have a 96 impala ss with 2 fans and 160
    thermostat and pcm flash by pcmforless.com does anyone have a write up for this conversion? How would I go about having my fans turn on at a
    certain degree?
    I think it is any year mark VIII (those are the round ones from the late 90s)
    As for what temp to turn on, I think that is done by a sensor on the engine.

  11. #10
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: Mark VIII cooling fan swap

    Nice thing about the dual fans is you have two different temps to activate them. Less power draw when you don't need it.

  12. #11
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    So is there really any upside to dual electric over single clutch fan?
    I always hear about mpg gains, but I didnt think the clutch fan drew that much power. Also, do they really give you any hp gains?

  13. #12
    carnut is offline Cadillac Owners Master
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    Re: Mark VIII cooling fan swap

    Assuming you have a fan clutch, not a solid fan, I doubt you would see a 2 MPG gain any time soon! The fan clutch disengages just above idle to gain mileage and should re engage at slow speed to pull air thru the radiator. The expense of the electric fan would be better spent in the gas tank. Given the age of your car, 16 MPG is very good. If you really want to improve mileage replace the trans with an overdrive unit. Electric fans, in my opinion, fitted to a car that didn't have them originally only provides male bragging rights with your buddies!

  14. #13
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: Mark VIII cooling fan swap

    Bragging rights are good too though. When my buddy at work puts the coil-overs on his Civic hatchback, I can be like, yeah well, I have the best factory electric fan conversion in my Cad, and now it gets .5 mpg better. And then he'd be like, your car only gets .5 mpg?

  15. #14
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by ferrisworld View Post
    Bragging rights are good too though. When my buddy at work puts the coil-overs on his Civic hatchback, I can be like, yeah well, I have the best factory electric fan conversion in my Cad, and now it gets .5 mpg better. And then he'd be like, your car only gets .5 mpg?
    I'd just use the "your car can fit in the trunk of my car" bragging right.
    turbojimmy likes this.

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