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Old 06-05-2010, 05:01 PM
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Elec rad fan motor - 3 wires ?

Ok, I got a electric radiator fan I'm working on installing in my project jeep.. and well, the electric motor has 3 wires coming out of it. 2 blue, and 1 black. I stripped the wires and jumped them with a 12v batter/jumper cables to test it. I was thinking the black is the ground/neutral wire, and the other 2 blue wires are the hot wires. So I supplied power to one blue wire at a time testing the fan. It worked.. but I cant figure out why there are 2 blue wires. I thought one was for low speed and the other for high speed. I could not tell any difference when jumping the wires. So, can anyone tell me what the 2 blue wires might be for ? Also the fan is out of a 05 ish pt cruiser.

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Old 06-05-2010, 05:18 PM
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It's probably for a thermostat. Or it's a two speed fan.JMO


Cole
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Old 06-05-2010, 05:31 PM
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I was thinking 2 speed. However.. I could not tell if it spun any faster when jumping the wires. Also the wire gauge are all the same.. about 14g I'm guessing.

I think I'm gonna wire it up as a 1 speed for now. Should I wire both blue wires to the hot or just pick one of them ?
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Old 06-05-2010, 05:35 PM
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Quote:
Originally Posted by JeepsAreBuilt
I was thinking 2 speed. However.. I could not tell if it spun any faster when jumping the wires. Also the wire gauge are all the same.. about 14g I'm guessing.

I think I'm gonna wire it up as a 1 speed for now. Should I wire both blue wires to the hot or just pick one of them ?

I would probably just tape one of them neatly out of the way for now. and just run one.IMHO I do know the pt had a two speed fan though.

Cole
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Old 06-05-2010, 11:50 PM
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The only way to increase the fan speed is to increase the voltage. More volts more speed, less volts slower. Reverse polarity and you reverse direction of rotation. I have a 3 wire.................Ground, Relay fed power controlled by sensor in coolant, and an Override switch.
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Old 06-06-2010, 08:52 AM
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one is for the temp switch and the other to the a/c so the fan runs all the time when the a/c is on
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Old 06-06-2010, 11:04 AM
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Quote:
Originally Posted by DOCTOR DC
The only way to increase the fan speed is to increase the voltage. More volts more speed, less volts slower. Reverse polarity and you reverse direction of rotation. I have a 3 wire.................Ground, Relay fed power controlled by sensor in coolant, and an Override switch.
Ok, sounds good.. so thats why I did not see any fan speed difference when jumping it with a battery. So, there is not a way for me to make this a "2 speed" unless I limit voltage to one lead, then full voltage to the other lead for high speed.

I like your override switch idea.. is this used without a relay and a high amp capacity switch ?

I plan to use coolant sensor switch to activate the fan.. but have not found a good switch for this. Any ideas ? 200 on, 180 off switch or something like that ?
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Old 06-06-2010, 12:21 PM
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Quote:
Originally Posted by JeepsAreBuilt
Ok, sounds good.. so thats why I did not see any fan speed difference when jumping it with a battery. So, there is not a way for me to make this a "2 speed" unless I limit voltage to one lead, then full voltage to the other lead for high speed.

I like your override switch idea.. is this used without a relay and a high amp capacity switch ?

I plan to use coolant sensor switch to activate the fan.. but have not found a good switch for this. Any ideas ? 200 on, 180 off switch or something like that ?
Painless makes them. You can get them from Summit. I see you are from Oregon, if not running A/C you can use a ny toggle type switch but make sure to use a relay. Fans draw too many amps to run through a small switch. You would need a relay anyway for your temp switch.
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