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  #1  
Old July 9th, 2005, 13:50
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Purple Purple is offline
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Fan override switch 97+ models

does anyone know how to make one? I know XJ-Armor sells it, but that guy is a jackass and i do not want to deal with him. Heard too many bad words about him. Anyway, i need to know where to splice the wires, etc... Thanks.
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  #2  
Old July 9th, 2005, 15:46
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Re: Fan override switch 97+ models

try here.

http://www.olypen.com/craigh/tech.htm
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  #3  
Old July 9th, 2005, 17:26
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Re: Fan override switch 97+ models

yeahh, i found that on google it will not work wirh 97+ models, Thanks Anyway
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Old July 11th, 2005, 12:36
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Re: Fan override switch 97+ models

Fan Over ride switch, as in turning on the fan before the temp sensor does?
IF that's the case just wire in a switch and relay. Mind the current draw on the fan. (Use 10 gauge wire on the primary side of the relay)
I wired a toggle in to bring the fan up for the tranny cooler if needed before the temp sensor turned on the fan. Since I by passed the radiator and installed a bit of overkill on the tranny cooler, I haven't needed it, tranny stays cool all day long. But it (the switch) works.
01 XJ.
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Old July 11th, 2005, 16:54
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Re: Fan override switch 97+ models

i understand, but what about the connection for the fan, the stock one, how do i wire in the switch and relay, so when i flip the switch to "on" the stock connection will get "disconnected" so no power goes to the stock control box/computer ...?
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Old July 11th, 2005, 17:45
baldwinwb baldwinwb is offline
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Re: Fan override switch 97+ models

I just turn on the AC to the lowest level, keeps the fan on. This way both you and the engine get cooler.
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Old July 12th, 2005, 21:32
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Re: Fan override switch 97+ models

lets say, its ....+15 C. and i dont want to run ac... just the fan...
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  #8  
Old July 12th, 2005, 21:49
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Re: Fan override switch 97+ models

In '97+ models, the aux. fan is negative switched. The general consensus seems to be to leave it alone, due to the ECU being involved. It, the ECU, would need to be isolated by relay or, I suppose the better way might be that a diode could be used to prevent current from getting to the ECU. I'm still looking for an acceptable way to do this, too.
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Old July 12th, 2005, 22:06
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Re: Fan override switch 97+ models

i will ask my friend HAM to solve this for me, what if the fan is operated manualy , and ECU Neg voltage kicks in? what will ECU get? will it get some kind of code that the fan does not respond or something?
maybe an additional fan would be the resolution? i have looked at the space between the grill and my ac/radiator cores, there is about ... hmm..2 inches?

I dont understand how somebody on ebay can be selling something like that, and there is no diagram on how to come up it.

Last edited by Purple; July 12th, 2005 at 22:20.
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  #10  
Old July 12th, 2005, 22:22
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Re: Fan override switch 97+ models

I did away with my factory fan, put in 2 electrics and wired them up to a double pole relay. one pole for each fans positive. I am using a thermostatic switch, and the original fan power wire to power the relay coil. no adverse effects, but I am only using the positive side of the fan circuit, and it is grounded straight to the battery.
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  #11  
Old July 13th, 2005, 07:07
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Re: Fan override switch 97+ models

I'm not sure how XJ Armor can claim it will work for '84-'01s because the circuits are different. I would think using it in a '97+ would trip the ECU and check engine light. Not sure, though; I know just enough about electronics and schematics to get myself into a good amount of trouble.
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Old July 13th, 2005, 13:34
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Re: Fan override switch 97+ models

I used the wiring harness that I bought used from a set of Piaa offroad lights (rated at 100W)-relay, switch. Connected the switch to relay, power from fuse box and splice the wires to the aux. fan (above the plastic connections). Works everytime I turn on the switch. No codes, no check engine light, no other problems that I can tell. Over 2 years now. I'm no expert at wiring stuff up-just letting you know what I did.
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  #13  
Old July 13th, 2005, 14:06
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Re: Fan override switch 97+ models

jxj--what year is yours?
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  #14  
Old July 13th, 2005, 14:17
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Thumbs up Re: Fan override switch 97+ models

Sorry,
2001 AW-4 Limited 5.5RE ARB Front & Rear Teraflex HP60 CRD Rear, Teraflex HP44 CRD crossover steering, Atlas II 3.8.
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  #15  
Old July 13th, 2005, 14:23
baldwinwb baldwinwb is offline
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Re: Fan override switch 97+ models

Quote:
Originally Posted by Purple
lets say, its ....+15 C. and i dont want to run ac... just the fan...
I think the defroster turns the aux fan on as well. It's hot as nuts here, I never use it.
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