Topic: electric fan for 90 yj

[fireman411]

Ok. I have been looking all morning at different post about which fan would be better. I was wondering, if I put the Ford Taurus electric fan on the 90, would it be best to run the wires to the positive and the ignition source or should I do it some other way? Im am not good with wiring and dc, ac, diods blah blah blah  I need some help

[sharpxmen]

fireman,
you need a "controller" and by that i mean something that turns on/off your e-fan based on temperature. it can be as simple as a thermocouple with a relay - it's been covered quite a few times including diagrams with wiring and relay(s), switches, thermocouple, etc. I think there are a few in the member's projects as well (aside of the work bench section). There is also Delta Current Control, a few members run it here and it is a variable speed controller (rather than on/off it will vary the speed based on themp).

[Jeffy]

Actually, you don't even need a controller.  You just need a relay.  Then run power from the battery to the relay and the 12v switch on the low side.

[sharpxmen]

you could but imo it kinda' defeats the purpose if you spin it continuously (will eat power via the alternator constantly just like the mechanical fan), i would assume the goal was to not have it spinning while on the highway for example since there's enough airflow to cool the engine.

[Jeffy]

you could but imo it kinda' defeats the purpose if you spin it continuously (will eat power via the alternator constantly just like the mechanical fan), i would assume the goal was to not have it spinning while on the highway for example since there's enough airflow to cool the engine.

Manually turn the fan off?  That's what I do actually.  I'll eventually get a SPAL or a DCC (but the guy does not replay to emails) as they put less strain on the engine when they start up the fan.  The shake is what broke my cat.

[jfrabat]

you could but imo it kinda' defeats the purpose if you spin it continuously (will eat power via the alternator constantly just like the mechanical fan), i would assume the goal was to not have it spinning while on the highway for example since there's enough airflow to cool the engine.

Not really; keep in mind electric motors "unwind" (by this I mean the draw far less current) when they are assisted (as in the wind coming in from the grill).  We used to calculate this with electric Remote Control planes as the difference in static and airborne power draw...

Manually turn the fan off?  That's what I do actually.

I've tried that, but I keep forgetting to turn it back on later on...

[sharpxmen]

Not really; keep in mind electric motors "unwind" (by this I mean the draw far less current) when they are assisted (as in the wind coming in from the grill).  We used to calculate this with electric Remote Control planes as the difference in static and airborne power draw...

you're right but so is the mechanical fan, at some point you do travel slower than the fan pulls so it is still an issue.

[zowtiak]

I have taken a lot from this forum, but  I found another website to help me install  my electric fan in my YJ. I am fairly handy, but when it comes to electrical projects I get a little nervous, and I have read a lot of post that make me think others are in the same boat.
     Before i found this website I did a straight hookup to the heater fuse on the fuse block under the dash (25a). This worked great and kicked on when i started the jeep. However, the first cool day we had blew the fuse when i ran the heater.
     I went and bought the thermostat and wiring kit at the local shucks, and off to the races. I used the schematic that would turn the fan on via the thermostat and keep it running even if I shut off the engine off of help cool it down. my brand new car does this so i figure it must have some merit.I took my time, made good connections and used lots of heat shrink, and in one hour I fired her up and she kicked on just as planned.
 I hope this helps. here is the linky:http://www.aaroncake.net/rx-7/efaninstall.htm
[url]http://www.aaroncake.net/rx-7/efaninstall.htm/url]