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Old 09-17-2011, 06:32 PM   #1
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Default Fan switch alternative

So after replacing everything short of the ECM that has to do with the fans turning on, I've decided to unplug the fans from the stock harness and run an aftermarket fan temp switch that can be set to a temperature and turns the fans on at that temp. Basically it'* a thermo-relay. Will I run into any voltage or electrical issues by doing this? For example when the engine hits the temp I set the fans will turn on. But will that power draw mess with other electrical systems?

I've already unplugged the fans completely and turned to the car on without throwing any codes.
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Old 09-17-2011, 06:35 PM   #2
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1995 Sse is the vehicle
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Old 09-17-2011, 09:50 PM   #3
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Should not cause any problems. But I do suggest using a switched power source so you don't have a problem where the fans keep running after shutting the car off.
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Old 09-18-2011, 08:26 PM   #4
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Is there a 12V ignition source that I could use to power the Automatic switch?
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Old 09-18-2011, 08:34 PM   #5
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i would hope the switch controls a relay, and the high current side of the relay operates the fans. then find a convenient source from the fuse block that is on with the key, run it through the temp switch then to the + side of the relay control side.
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Old 09-20-2011, 09:23 PM   #6
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I'm not quite sure what you mean. The switch itself is a thermorelay. Meaning it has a temperature probe that controls the current running through the switch itself. I just need a 12V ignition source that is controlled by ignition that'* under the hood preferably. I just touched wires to the contacts and i kept blowing the inline fuse. I did notice that I was spinning the fans backwards. Would that cause fuses to blow? Does anyone know what amperage those fans require?
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Old 09-21-2011, 08:06 AM   #7
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fans require alot of current to run, you have it wired backwards if they are going backwards but i dont think thats your fuse problem. look at the original fan fuse they are usually 20-30a. do you have a link or something to what you have?

this is what you should do;
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Old 09-21-2011, 02:36 PM   #8
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http://www.autozone.com/autozone/par...67187_69565_0_

I believe I was using a 25a fuse but I'm
Not sure. It was only 18g awg at most maybe 16. I don't want to chop up
Wires or cut and rerun them. I'm going to unplug the fans and just run a new wiring harness
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Old 09-21-2011, 03:35 PM   #9
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I dont know what you mean just run a new harness,

read the instructions you dont want to wire it that way it will just run without the key, but if you get a relay you can do it this way.
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Old 09-21-2011, 06:24 PM   #10
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The switch itself is a relay that connects charge when it receives a signal from the attached probe. So the switch needs positive and the ground. So the switch is in between the battery and the fans. I'm just not quite understanding the purpose of another relay in the mix
Of all that. Is the positive connection that is located in the maxi fuse block
Should I just run a feed to the fuse block under the drivers side?

Im weary about going above a 20a fuse for the fans. But I have a 30a right now
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