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Electric Fan Setup

posted by  someone claiming to be Chevy on  Sun Nov 19 17:17 CST 2000 [RELATED]

I don't have a 7xx, but I'm wanting to use the cooling fan setup off one so that's why I'm asking you.

I want to replace my Mechanical fan on my 144 with an electric one off a 7xx because I don't have A/C and most of my driving is above 35mph so I don't need the fan but I still want one for when it's dead idling. Apart from the fan, what do I need to remove off the donor 7xx. Would this conversion be possible?

Thanks!







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    Re: Electric Fan Setup

    posted by  someone claiming to be Lee on  Sun Nov 19 19:00 CST 2000 [RELATED]

    A temperature switch would be good. You won't want the fan on until it's needed. The one on the 700 won't mount on your radiator, but you can get one that mounts universally. The switch should operate a relay, not directly run the fan.







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      Re: Electric Fan Setup

      posted by  someone claiming to be Chevy on  Sun Nov 19 22:17 CST 2000 [RELATED]

      This post was supposed to go in the 700 series forum but I guess it's now across all the forums.

      My local wrecker told me that it wouldn't be worth it to get a fan out of a 700 because of the problems with the thermostat and electricals.

      I only want the fan when it's needed, which won't be too often, and also on a switch (with relays of course).

      If the thermostats from a 700 only turn the fan on before it overheats then it would be to late for my car since it would be the only the electric fan cooling, not the mechanical one as well. Is it the thermostat that decides when to turn the fan on or is it the elctricals associated with the fan?

      Where would the thermostat go?

      I'm wanting to remove the mechanical fan and either mount the electric on the back of the radiator or if it doesn't fit, on the front.

      Any advice or thoughts would be appriatated.

      Thanks!!!







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        Re: Electric Fan Setup

        posted by  someone claiming to be JOhnH on  Mon Nov 20 09:16 CST 2000 [RELATED]

        Chevy,

        Long winded answer coming:

        I've fitted electric fans to my Amazon and to a TR6 that we rally. Fit the fan to which ever side of the radiator you can (back is better, because the fan doesn't obstruct the fins, but it's no big deal).

        Then fit a decent relay (at least 25A), drawing fused power through the 30 and 87 terminals, to the fan, then to earth. You must use a relay, because a switch will melt down if you try and switch that much current through it. Use heavy cable (capable of at least 25A) for the same reason.

        To triggger the relay, pick up live (also fused, but since it is only switching the relay, it need not be high amps) power and run to one side (i.e. the 85 or 86 terminal) of the relay. The other side (i.e. the 86 or 85) side of the relay goes to a 3 way (i.e. on-off-on) switch on the dash. One side of the switch goes directly to earth, the other down to a thermo switch, then to earth. This is a bit of overkill, but it lets you turn the fan on or off yourself, or let the thermo switch take over (which is what you do all the time anyway!)

        I had a fitting sweated in the bottom tank of the radiator to take a screw-in thermo switch, although it is probably easier to get one of those thing you poke between the radiator fins, or slip in a rad hose. Your local AutoOne in Chatswood sells them. I don't like them much, although they are adjustable so you can change the temp at which the fan cuts in.

        If you go the thermo switch route, get one that turns on when the water going back into the block is the temp you want for cooling.

        You can put a thermo switch in the top tank, but I figured if your water level gets low, then the switch mighn't be immersed in water and so mightn't work - just when you want it to.

        JohnH

        PS Make sure the fan is wired the right way around - put the + and - back to front and the fan will run backwards: you don't want that. Make sure that air is coming through the rad from front to rear.







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        Re: Electric Fan Setup

        posted by  someone claiming to be Evan R on  Mon Nov 20 01:59 CST 2000 [RELATED]

        A common fan swap in the 24x uses the fan from a FWD Buick, Pontiac, or Olds with the 3.8l V-6. Swap info can be found at turbobricks.org

        Aftermarket sensors usually slip between radiator fins.






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