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Unread 04-09-2012, 05:16 AM   #1
79OldBlue
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1976 CJ5 
 
Join Date: Aug 2011
Location: Columbus, GA
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Cool it down!!! (Contour Fans)

So I'm heading out to the scrapyards today to find a Contour fan to put into the CJ; I though I'd gather some info from the masses before I pick my hardware. So here are a couple questions I've got-

1)From reading other threads, it sounds like there are two versions of the contour fan out there; one that has high/low speeds, and one that has only one speed. Am I correct on this?

2)I want to run dual relays/ fuzes. If it's a dual speed fan, I want to go with low speed comes on at temp X and high speed on at temp X. If it's single speed, I want ONE fan to come on at temp X and the second to join at a higher temp. What temperatures should I use? I was thinking 190 and 200, but that's just a guess...

3)I've got a 195 thermostat in it right now. Overheating is a big concern, and it'll be a bigger concern in about two months when these GA summers really kick in. Should I be running the 180 thermo instead?

The info ought to be in my profile, but if it's not, I've got a 76 CJ5 w/ a 258. BTW, I just got done replacing the radiator w/ a stock replacement; once I get the fans put in, I'll put up some pics of the upgrade as a whole so everyone can give there thoughts, comments, and petty insults.

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Unread 04-09-2012, 05:53 AM   #2
Matt1981CJ7
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79OldBlue,

My father called his '81 CJ7, that I currently own, "Old Blue". He even had a custom spare tire cover made that said, "Old Blue. She's tried and true."

Anyway, I'm not a cooling expert. The stock radiator and fan have always kept my 258 plenty cool. It does seem like a lot of guys have cooling issues, though. I always wonder if that's fuel mixture related, or tuning, or if the stock cooling setup is truly inadequate.

Sorry I couldn't be more help. I just saw the handle "Old Blue" and I had to comment.

Matt
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Unread 04-09-2012, 06:44 AM   #3
mtndrew
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I put a 180 thermostat in my 258 and it really helped on the hot days and those long hills.
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Unread 04-09-2012, 06:48 AM   #4
RobsCrawlin7
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i am putting a contour fan in mine. heres a good thread on more info.

www.jeepforum.com/forum/f8/contour-fan-writeup-1307826/

i am just waiting on the fan controller to show up...aaaannnnny day now
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Unread 04-09-2012, 07:00 AM   #5
79OldBlue
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Matt-

It's not that it's inadequate right now, just want to keep it cooler. It'll get me around just fine (for the most part) but as the RPMs get up, the temp gets up higher than I would like it. Just adding to the cooling components to keep it from getting away from me.

Funny thing about my handle being "79OldBlue"- my first jeep was a 79 CJ5 that was blue. I sold it because it was WAY past my ability to fix; now I've got a 76 that's yellow and runs like a champ!
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Unread 04-09-2012, 07:08 AM   #6
Matt1981CJ7
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Quote:
Originally Posted by 79OldBlue View Post
Matt-

It's not that it's inadequate right now, just want to keep it cooler. It'll get me around just fine (for the most part) but as the RPMs get up, the temp gets up higher than I would like it. Just adding to the cooling components to keep it from getting away from me.
Ahhh...preventative measures...probably a good idea, then.

My factory temp gauge rarely gets over half-way. I've never seen it over 3/4, even on the steepest climbs. And that's with a massive Warn 8274 sitting in front of the radiator.

Hopefully, my factory gauge isn't lying to me.

Matt
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Unread 04-09-2012, 12:05 PM   #7
titomars
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Quote:
Originally Posted by 79OldBlue View Post

1)From reading other threads, it sounds like there are two versions of the contour fan out there; one that has high/low speeds, and one that has only one speed. Am I correct on this?

2)I want to run dual relays/ fuzes. If it's a dual speed fan, I want to go with low speed comes on at temp X and high speed on at temp X. If it's single speed, I want ONE fan to come on at temp X and the second to join at a higher temp. What temperatures should I use? I was thinking 190 and 200, but that's just a guess...

3)I've got a 195 thermostat in it right now. Overheating is a big concern, and it'll be a bigger concern in about two months when these GA summers really kick in. Should I be running the 180 thermo instead?

The info ought to be in my profile, but if it's not, I've got a 76 CJ5 w/ a 258. BTW, I just got done replacing the radiator w/ a stock replacement; once I get the fans put in, I'll put up some pics of the upgrade as a whole so everyone can give there thoughts, comments, and petty insults.
1.) there are two contour fan assemblies. A single fan single speed assembly and a Dual Fan dual speed assembly. You want the dual fan assembly. It came on the higher performance engine and A/C cars. It is also used on the Mercury Mystique. the dual fan unit is easily converted to single speed if you want.

2.) thermostat temp is you guideline here. If you are using a 180 deg t/stat you want a fan on of about 195 deg and fan off at about 185 deg for a single speed. A two speed would have tighter off and on settings but an adjustable controller makes dialing the settings in easier.

3.) if your jeep is running too hot now with a 195 deg t/stat swapping to a 180 deg one is not going to help. you need to find out why its not cooling.
the t/stat is only governing the earliest open temp. once any t/stat is open they all flow about the same. With a 195 deg t/stat your normal running temp should be around 200 to 205 deg.

I did mine and I think it is one of my best mods. I did not like the controller probe ideas so i converted mine to a single speed dual relays and used a sensor in a 4.0 t/stat housing.
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Unread 04-09-2012, 06:45 PM   #8
79OldBlue
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Alright! I found the fan in a 2000 Cougar! The wife and I pulled it out (easier said than done) and I've got it back here. Tomorrow I'll hotwire it and make sure that it works; after that I'm heading to the parts store to pick up a couple controllers and put it in there!

Here's a NEW question now though- I found a 4.0 thermostat housing in the scrapyard that I have to go back for tomorow. I want to throw it on there to avoid putting the probe through the radiator, but I don't know if the thermo housing is going to be compatible; anyone know?

If it IS compatible, can I just use that one sensor to trigger both relays? I'd like to avoid sticking anything into the radiator if I can.
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Unread 04-10-2012, 08:53 AM   #9
titomars
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In doing my research, a single temperature sender/sensor will not control two speeds unless you have an ECM that is capable. so if you were to use a sender in a 4.0 housing you would have to be content with a single speed setup. I could not find an affordable 2 spd. controller setup that did not use probes that just stuck in to the rad core. I originally wanted 2 spd. fans but I just did not like what was available for controlling them. I did not want to run 2 separate sensors in my engine for fan control, one for low and one for high. So I just rewired the fans and made everything a single spd.

Yes you can use one sensor to trigger 2 relays. That's what i did.
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Unread 04-11-2012, 11:01 AM   #10
Outnumbered
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I ended up using two weather tight relays from a 90's GM car and a $15 temp switch from Oreilly threaded into the manifold near the CTO. One relay for each fan.

Since I have an auto I wired the lower fan to be always on and triggers from the oil pressure switch. The 2nd fan runs off the temp switch. The switch is 208* I believe. I'm running a 3-core with a 195* t-stat. The lower fan alone WILL pull air from the entire radiator regardless of what you have read. I tested it before I wired it up this way by using 1/2 of a paper towel. With only the lower fan on the Contour fan will pull so much air that it will stick 1/2 a paper towel to the radiator anywhere on the front fins. The jeep runs nice and cool and can sit and idle with no rise on the gauge. The only time I have seen the 208* fan kick on so far is after a drive and shut down. The fan will kick on and run for about a minute and then shut down. I wired it this way intentionally. The top fan is not "key on" or oil pressure switched so if my OP switch fails the high fan will kick on at 208*.

Here is the switch...

Murray - Engine Mounted Cooling Fan Temperature Switch

Part # 35946

Line: MRY

Online:

Available
Store:

Usually Avail. 24 Hrs


for this item only

Add to Printable List $15.99 Each








(ignore the crappy ground wire above the relays, that was a PO headlight ground that I have not looked into yet)
imag0963s.jpg   imag0964s.jpg  
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Unread 04-11-2012, 11:32 AM   #11
CJ Chet
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I used the 4.0 thermostat housing on mine. Works like a champ. Got a switch from Painless and used it for a relay trigger. No problems at all!


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Unread 05-16-2013, 05:17 PM   #12
BleepinJeep
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Quote:
Originally Posted by Outnumbered View Post
I ended up using two weather tight relays from a 90's GM car and a $15 temp switch from Oreilly threaded into the manifold near the CTO. One relay for each fan.

Since I have an auto I wired the lower fan to be always on and triggers from the oil pressure switch. The 2nd fan runs off the temp switch. The switch is 208* I believe. I'm running a 3-core with a 195* t-stat. The lower fan alone WILL pull air from the entire radiator regardless of what you have read. I tested it before I wired it up this way by using 1/2 of a paper towel. With only the lower fan on the Contour fan will pull so much air that it will stick 1/2 a paper towel to the radiator anywhere on the front fins. The jeep runs nice and cool and can sit and idle with no rise on the gauge. The only time I have seen the 208* fan kick on so far is after a drive and shut down. The fan will kick on and run for about a minute and then shut down. I wired it this way intentionally. The top fan is not "key on" or oil pressure switched so if my OP switch fails the high fan will kick on at 208*.

Here is the switch...

Murray - Engine Mounted Cooling Fan Temperature Switch

Part # 35946

Line: MRY

Online:

Available
Store:

Usually Avail. 24 Hrs


for this item only

Add to Printable List $15.99 Each








(ignore the crappy ground wire above the relays, that was a PO headlight ground that I have not looked into yet)

Can you please help me figure out how to wire this switch to work? I have the same switch but am having no luck...

It's my impression that the switch will short to ground when the temp reaches 208. So I have it hooked up to the stock fan relay on my XJ. the relay has two wires so I connected one to ground near the switch and the other to the pigtail coming off the top of the switch. However, that didn't work. I then tested the switch in a pot of boiling water and it is not shorting to ground... Am I using the switch wrong or do I have a bad switch?

Thanks for the help!
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Unread 05-16-2013, 05:19 PM   #13
BleepinJeep
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Quote:
Originally Posted by CJ Chet View Post
I used the 4.0 thermostat housing on mine. Works like a champ. Got a switch from Painless and used it for a relay trigger. No problems at all!


Do you have a part number for this switch? I'd like to see the specs.
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You Tube - [url]https://www.youtube.com/user/bleepinjeep[/url] - Awesome Jeep Related How-To Videos in HD.

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Unread 05-16-2013, 05:24 PM   #14
Outnumbered
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Quote:
Originally Posted by BleepinJeep View Post
Can you please help me figure out how to wire this switch to work? I have the same switch but am having no luck...

It's my impression that the switch will short to ground when the temp reaches 208. So I have it hooked up to the stock fan relay on my XJ. the relay has two wires so I connected one to ground near the switch and the other to the pigtail coming off the top of the switch. However, that didn't work. I then tested the switch in a pot of boiling water and it is not shorting to ground... Am I using the switch wrong or do I have a bad switch?

Thanks for the help!
Just ground (-) to the temp sensor switch instead of the chassis. It will create a ground at about 208* and complete the circuit. I'm not familiar with XJ relays so I cannot say what is going on with them but I'm fairly certain there is a computer control aspect to the XJ that the CJ did not have.

Good luck
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Unread 05-16-2013, 05:28 PM   #15
titomars
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Quote:
Originally Posted by Outnumbered View Post
Just ground (-) to the temp sensor switch instead of the chassis. It will create a ground at about 208* and complete the circuit. I'm not familiar with XJ relays so I cannot say what is going on with them but I'm fairly certain there is a computer control aspect to the XJ that the CJ did not have.

Good luck
On XJ's the ECM does control fan operation.
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