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Are you sure that you want to do this? Your average block temperature can rise a bit after turning off the car. The oil that's up by the valves will like you better if you let the car cool down a bit with the fan.
I'm planning an electric fan conversion myself and I'm gathering the last few parts that I need right now. I'm using a 6 blade fan from an '87 Cutlass Cierra that I'm parting out. The basic logic control that I'm planning to use is the following:
-Fan can operate anytime the temperature is over ### degrees farenheit (via temperature probe in the radiator and a relay to main battery).
-Fan will turn on when A/C turns on.
-Fan can be manualy over-ridden to ON position for improved cooling in anticipation of hard uphill climbs ahead, etc (before the car is actually subjected to the increased load). This will be done by a toggle switch inside the cabin mounted next to the hazard switch.
-Fan can operate as needed to cool the car after ignition is turned off and key is removed. (thus preventing oil that's up in the top of the engine from being cooked by a hot block just after a hard drive, -yes block temperature can increase a bit after stopping coolant flow when you shut off the engine)
-"Summer mode" can be activated to run the fan for an additional 30 seconds to 2 minutes after the car is shut off (I haven't decided how long yet). I plan to use a modified timer relay/solenoid like the one that runs the overhead light in the cabin when you open the driver's door. This is a nice feature to cool your car after a hot drive in the summer and is available on many Chrysler vehicles since the early 1980s (however the Chrysler versions have 3 to 5 minute timers).
Assuming you have a good battery in your car, you shouldn't need to worry about the fan draining your battery dry during it's "post-drive-cooldown." Heck, assuming I have a full charge in my battery and I'm not using the headlights or blower, I can drive for about 4 to 6 hours on the remaining charge if my alternator should fail. I also do a lot of volunteer work for the Sheriff's department in their Emergency Services unit. My vehicles see frequent use for traffic direction at major accidents and I don't always leave the engine running. Do the math, have an idea of how many amps your lights/strobes are drawing and what the rating of your battery is, -and don't go below the half way point for safety. My best/longest time was leaving the car off, with highbeams on for 3+ hours to illuminate an equipment teardown that I was assisting. Gotta love those Interstate batteries!!!
Good luck with your decision and your work ahead of you.
God bless,
Fitz Fitzgerald.
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'87 Blue 245, NA 214K
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