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Cooling Discuss all of the aspects of cooling that you can think of! Radiators, transmissions, electric fans, etc.

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Old 05-22-2012, 12:40 AM   #1
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How to wire fan to come on automatically

Hi all.

Ok, I have currently a switch wired (via a relay) to turn on/off the dual fans. Radiator has been upgraded on my T/A '84.

Thing is I don't want them on all the time and only when required. This is the bit that I'm not sure on how to do.

Obviously I need a sensor (essentially to replace the switch) to detect temp and activate fans, but how do I wire this in and where should it be?
Would prefer not to use those probe things that go into the radiator pipes.

Thanks all

Jonno.
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Old 05-22-2012, 06:43 AM   #2
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Re: How to wire fan to come on automatically

It depends on which T-stat your using as to which in the head temp switch you want.
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Old 05-22-2012, 06:45 AM   #3
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Re: How to wire fan to come on automatically

All you need to do is go to summit or jegs (or the retailer of your choice) and get a temp switch. it screws into the side of the head. there are diff temp ratings so pay attention. some come on at 190 some come on at 200 etc... Now the wiring for it is simple. Basically if you have a relay in the system then youre 90 % done. The temp switch is technically just an activated ground. so your ground for the fan system that you currently have just gets disconnected and reconnected to the wire for the temp switch. Viola! done... its really simple....
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Old 05-22-2012, 07:01 AM   #4
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Re: How to wire fan to come on automatically

My dual fans both run automatically with either head temp or AC. Here's the how-to, should you be interested:

http://www.thirdgen.org/techboard/co...electrics.html (Belt Fan to Dual Electrics/Pics and P/Ns)

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Old 05-22-2012, 08:38 AM   #5
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Re: How to wire fan to come on automatically

Cool. Does anyone have the part number for the switch for the '84?
Im thinking on the Summit racing site it is a TX4.

Cheers.
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Old 05-22-2012, 10:25 AM   #6
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Re: How to wire fan to come on automatically

Autozone SW555

the switch makes at 210f breaks at 205f

Then get this pigtail (PT308 or PT770)

http://www.autozone.com/autozone/par...h&fromType=oem

<20 total

http://www.thirdgen.org/techboard/co...tched-pns.html (List of fan switched PNs / Threads / Connectors)

Here is a list of sensors

Last edited by midias; 06-13-2012 at 01:31 PM.
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Old 05-27-2012, 10:54 AM   #7
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Re: How to wire fan to come on automatically

http://cgi.ebay.com/ebaymotors/JEGS-...item484455c1fe
i've been running one of this and a 40 amp relay with a 2 row radiator and a thuderbird fan for over a year now and was running 2 on my 04 Ram to control a dual speed thunderbird fan they work great you can adjust to any temperature
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Old 06-13-2012, 12:22 AM   #8
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Re: How to wire fan to come on automatically

Hi all. Just got round to looking at this again. Why does the Autozone page tell me that the SW555 is not suitable for my engine?
It looks like it should be SW500. the pigtail looks right though, PT770.

Cheers.
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Old 06-13-2012, 01:29 PM   #9
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Re: How to wire fan to come on automatically

Quote:
Originally Posted by djjon76 View Post
Hi all. Just got round to looking at this again. Why does the Autozone page tell me that the SW555 is not suitable for my engine?
It looks like it should be SW500. the pigtail looks right though, PT770.

Cheers.
Because it is not the correct switch for your engine. It comes on at a lower temp than the sw500 and is a bit more preferable. They interchange physically.
Code:
SW500	1		3/8 x 18	Open	Makes 230f  8
SW501	1		3/8 x 18	Open	Makes 222-239 f
SW502	1	        3/8 x 18	Open	Makes 238f  8
SW505	1		3/8 x 18	Open	Makes 221f  8
SW555	1	        3/8 x 18	Open	Makes 210f Breaks 205f

Last edited by midias; 06-13-2012 at 01:32 PM.
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Old 10-10-2012, 07:26 AM   #10
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Re: How to wire fan to come on automatically

Hi all.
Sorry to bring an old thread back to life, but what thermostat should I use with the SW555 switch?
Can this be installed in the thermostat housing, or should it really be installed in the head?
Same with the temperature gauge sensor.... Should this be in the head not on the thermostat housing?

Cheers.

Jonno.
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Old 10-11-2012, 12:23 AM   #11
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Re: How to wire fan to come on automatically

I've just re-read my post and it sounds like I am asking where the thermostat should go!!!

I meant to say where should the SW555 switch go?

Is this really the right one anyway? From what I have been reading, one that comes on at a lower temp seems to be more preferable.

cheers.
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Old 10-11-2012, 07:13 AM   #12
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Re: How to wire fan to come on automatically

Quote:
Originally Posted by djjon76 View Post
I've just re-read my post and it sounds like I am asking where the thermostat should go!!!

I meant to say where should the SW555 switch go?

Is this really the right one anyway? From what I have been reading, one that comes on at a lower temp seems to be more preferable.

cheers.
I put mine in the head, you can get a lower one if you want but factory is 220-230 so the sw555 comes on much lower.
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Old 10-11-2012, 06:46 PM   #13
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Re: How to wire fan to come on automatically

Hmmmm.... As I wont be driving the car much in winter over here, in summer it's not uncommon for us to have weeks where we have 36c (97f) plus temperatures everyday, I'm thinking one that comes on at a lower temp, combined with a lower thermostat (say 160f thermostat, with a 175f switch), might be better suited.

Thoughts?
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Old 10-12-2012, 03:21 AM   #14
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Re: How to wire fan to come on automatically

A 180* stat seems to be popular.Thats what I run with a adjustable switch set to come on at 170*.With the new radiator and fan the car actually stays in the 180* 190* range. Even in traffic.I also have a engine oil cooler installed that only allows the oil to flow through it at 180*(using a sandwich adapter thermostat).One of the reason for the 180*stat and 180* cooler is because you want the oil to reach a decent operating temp.

Last edited by Ron U.S.M.C.; 10-13-2012 at 12:21 AM.
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Old 10-13-2012, 05:35 PM   #15
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Re: How to wire fan to come on automatically

With a 180f thermo. Wouldn't you set the fan switch to come on higher? Say 190 or something?
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Old 10-13-2012, 11:32 PM   #16
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Re: How to wire fan to come on automatically

I also have a 6"x17" extra transmission oil cooler that runs constant and I like the idea of the fan keeping it at the lower temp.My fan set up is probably a little different than most . I use a 16" front pusher fan that is set directly in the middle of the radiator as my primary fan switched on at 170*.Then I have two large oil coolers mounted side by side in the center on the engine side with a 12" puller fan mounted over them set at 200*as a back up fan.
Some of this set up is new to me because I made some adjustments with a new primary fan controller when I did the new radiator install about two months ago.
So far I'm more than happy with it.

Last edited by Ron U.S.M.C.; 11-16-2012 at 02:26 AM.
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Old 11-09-2012, 11:58 AM   #17
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Re: How to wire fan to come on automatically

Ok, I'm having some issue with my temps.

driving the car is fine, fast, slow doesn't really matter. But at idle the temp steadily rises to around 200, then the fan kicks on and it steadies out around 220 at idle.

The fan is wired into the thermostat housing.

I will get some pics of the mess I have later.

Thanks,
Paul
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Old 11-09-2012, 12:00 PM   #18
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Re: How to wire fan to come on automatically

Quote:
Originally Posted by carbonf00trpint View Post
Ok, I'm having some issue with my temps.

driving the car is fine, fast, slow doesn't really matter. But at idle the temp steadily rises to around 200, then the fan kicks on and it steadies out around 220 at idle.

The fan is wired into the thermostat housing.

I will get some pics of the mess I have later.

Thanks,
Paul
Seems fairly normal to me
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Old 11-14-2012, 06:03 AM   #19
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Re: How to wire fan to come on automatically

That's the factory operating temps for our cars. It's also known that our factory gauges are notoriously unreliable. Mine reads 20* to hot, compared to the temp at the thermostat housing when taken by an IR gun. I'm currently runnin a 180 T-stat and Jet Fan switch, comes on 195, off at 185.
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Old 11-14-2012, 08:13 AM   #20
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Re: How to wire fan to come on automatically

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Originally Posted by Ozz1967 View Post
That's the factory operating temps for our cars. It's also known that our factory gauges are notoriously unreliable. Mine reads 20* to hot, compared to the temp at the thermostat housing when taken by an IR gun. I'm currently runnin a 180 T-stat and Jet Fan switch, comes on 195, off at 185.
My factory gauge is bad. Using an aftermarket gauge and IR gun I have learned just how bad.

At true 180F the factory gauge is 220 at 210F the factory gauge is 260+
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Old 11-14-2012, 08:13 AM
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