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Unread 01-01-2014, 09:32 PM   #1
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1978 CJ5 
Join Date: Nov 2009
Location: So. Cal
Posts: 184
Electric fan wiring question

Hello all,
I have a question regarding the wiring of an electric fan for a cj5 with a 258. The question is regarding the thermostatic switch. I have two options and need a recommendation:
1- wire the fan using a thermostatic switch threaded into the cooling system (negative trigger through relays) or
2- using thermostatic switch that pushes a probe into the fins of the radiator.

I know how to wire each, but I am not sure which route I should take. Any suggestions would be greatly appreciated.

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Unread 01-01-2014, 10:03 PM   #2
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1976 CJ5 
Join Date: Nov 2007
Location: Canton, Michigan
Posts: 2,541
I prefer to get temperature information from the coolant, rather than the radiator.

Personal preference, either will work.
"In the end...It's all Hack."
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Unread 01-02-2014, 06:00 AM   #3
CJ Chet
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1986 CJ7 
Join Date: Dec 2005
Location: Yorktown, Virginia
Posts: 2,575
I used a 4.0 thermostat housing and screwed a Painless switch into it. Easy and effective!

Beer is the answer - it doesn't matter what the question is!

'86 CJ7, 265 CI, DUI, TF999, Borla, Weber, 4" BDS Lift.
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Unread 01-02-2014, 10:15 AM   #4
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1978 CJ5 
Join Date: Jun 2005
Location: Albany~town, Oregon, Oregon my home and for 200 billion slugs
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On 'Balck Betty' when I first got 'er she had a radiator fin probe on an existing pusher fan. Over the course of the next two months the downtube next to the probe deveoped a small leak (dissimilar metals, fibration, etc). So I searched for another way, I found this double ported radiator hose sleeve from Summit

and now with my newer Merc Mystique dual fan assy. I am controlling the fans independantly. This cleared up a long standing overheating issue in the summertime and I'm ever grateful to JeepHammer amongst others that lended their support in helping me get a handle on this thing.
The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
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Unread 01-02-2014, 06:39 PM   #5
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1978 CJ5 
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Location: So. Cal
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Thanks everyone for the replies. I will be going with the switch plumbed into the cooling system. I really appreciate the information.
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