cooling fan temp sensor wiring question - Chevelle Tech
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post #1 of 11 (permalink) Old Feb 25th, 16, 2:56 PM Thread Starter
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cooling fan temp sensor wiring question

I recently added aftermarket AC to my 67 El Camino. I thought installing an aux electric fan would be a good idea.
I am going to wire it through a standard Boch style relay and that is all pretty straight forward.
My question is the sensor that came with it, it has 2 prongs to wire to.
My experience has been with a single connection that when at the right temp provides a path to ground and completes the circuit.
I have been searching for any kind of diagram on how to wire the 2 connections. I connected my VOM on the continuity setting and connected to both connections, and carefully heated the probe end with a bic lighter very slowly (to not damage it) but it never completed the circuit.
The sensor has a part # KSD301-P but when I google that I find everything but that.
Am I correct in assuming that the 2 connections are the path to ground and wire it that way?
Thanks for any insight on this, because I am almost at the point of purchasing a sensor with only 1 connection if I cannot figure this one out.

Mick

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post #2 of 11 (permalink) Old Feb 25th, 16, 3:12 PM
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Re: cooling fan temp sensor wiring question

Can you post a picture of the sensor. Is it long and thin? That may be a thermocouple not a switch. If it is, it needs to wire to a circuit board not directly to a relay.
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post #3 of 11 (permalink) Old Feb 25th, 16, 3:16 PM
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Re: cooling fan temp sensor wiring question

If it is disk shaped, the two wires are probably the normally open or normally closed switch connections, neither going to ground.

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post #4 of 11 (permalink) Old Feb 25th, 16, 3:38 PM Thread Starter
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Re: cooling fan temp sensor wiring question

Here is a pic of the sensor my fingers are covering up the small threaded post that screws into the brass piece, that is screwed into the bung on my water pump
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post #5 of 11 (permalink) Old Feb 25th, 16, 3:47 PM
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Re: cooling fan temp sensor wiring question

I would say that neither terminal makes a path to ground. 82 degrees C is 180 degrees F. It should either open or close a connection between the two terminals at 180 degrees.

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post #6 of 11 (permalink) Old Feb 25th, 16, 3:52 PM
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Re: cooling fan temp sensor wiring question

It probably would complete the circit between the terminals at 180*. But I would call the seller to verify.
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post #7 of 11 (permalink) Old Feb 25th, 16, 4:18 PM Thread Starter
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Re: cooling fan temp sensor wiring question

Thanks, I guess I was wording the question wrong, that at temp the 2 prongs complete a connection, so if the connection was to complete the path to ground if it went from one connection to the other.
The problem contacting the seller is that I bought this stuff last summer, and am now just getting around to installing it and could not find the paperwork that came with it. That is on me :-(

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post #8 of 11 (permalink) Old Feb 25th, 16, 7:16 PM
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Re: cooling fan temp sensor wiring question

I would put the sensor in hot water above 180* & check for continuity between terminals & terminals to the base.
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post #9 of 11 (permalink) Old Feb 26th, 16, 9:55 AM Thread Starter
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Re: cooling fan temp sensor wiring question

Quote:
Originally Posted by 1967 chevelle malibu View Post
I would put the sensor in hot water above 180* & check for continuity between terminals & terminals to the base.


That will be the next thing I am going to try. Hopefully that is it. I kind of tried that with the lighter, but I was worried about damaging it, I don' think water will.

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post #10 of 11 (permalink) Old Mar 2nd, 16, 11:14 AM Thread Starter
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Re: cooling fan temp sensor wiring question

Just a follow up, I did use the hot water test as suggested and discovered that at 180* there was continuity between the 2 connections, and as it cooled down I could actually feel the disconnect (kind of a click) but now I can wire this up correctly.
Thanks to all who pitched in with comments, and suggestions.


~ Mick

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post #11 of 11 (permalink) Old Mar 2nd, 16, 9:49 PM
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Re: cooling fan temp sensor wiring question

Sweet! Glad you are on your way.

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