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  #73  
Old 09-30-2009, 08:15 PM
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Re: 180 degree T-stat

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Originally Posted by dreamer1213 View Post
Depends on what kinda fan you have....if you have an electric fan that yes....a switch is possible...when I went to the track with Harrison he had a switched wired to his SRT8's fan to where he could let the fans run while the Jeep was off...

If you have a mechanical or clutch fan...then there is no way to "override" it...my WJ and the HEMI WK's, not sure bout the 4.7 WK's are hydraulically cooled...the powersteering system's pressure controls the fan....don't think you could hook a switch up to it, since the powersteering pump has to be running for it to be able to get pressure to the fan..
I had an idea. what about using a smaller PS pulley so the pump builds more pressure? Thus spinning the fan at a higher speed.
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  #74  
Old 09-30-2009, 08:18 PM
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Re: 180 degree T-stat

Well my 4.7 has a clutch, belt driven fan. But it also has an aux. fan with a high and low speed setting. Yer saying that my aux fan could not be electric preventing me from installing a switch? It probably is a crazy hydro fan or whatever preventing a simple solution such as this.
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  #75  
Old 09-30-2009, 08:20 PM
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Re: 180 degree T-stat

Thats an idea...you should sooo try it Ryan!!
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  #76  
Old 09-30-2009, 08:23 PM
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Re: 180 degree T-stat

Isn't that aux fan to just cool the AC's radiator...I've never looked inside a WK's engine bay...so I'm not sure....how bout you take a pic if you can please...that way I'll be able to better tell...where does this fan sit? Right in front of the clutch fan, or to the side?

On my dad's Hemi Ram, he has a secondary fan that only cools the AC's radiator...and it's only on when the AC is on...
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  #77  
Old 09-30-2009, 08:24 PM
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Re: 180 degree T-stat

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Originally Posted by Sleepy4.7 View Post
I had an idea. what about using a smaller PS pulley so the pump builds more pressure? Thus spinning the fan at a higher speed.
Well yeah i mean i guess but the problem still lies in letting the computer turn it on at 195 or 210* versus you flipping a switch.

I had been thinking that our Jeeps have to have relays to turn the fans on and off. So i did some searching and came on this saturn forum at this link, ( http://www.saturnfans.com/forums/sho...t=23668&page=3 ) post 44, where a guy posts up a drawn schematic of a switch that will turn the relay on and or off thus activating his cooling fans. Possibilities here?
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  #78  
Old 09-30-2009, 08:26 PM
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Re: 180 degree T-stat

Quote:
Originally Posted by dreamer1213 View Post
Isn't that aux fan to just cool the AC's radiator...I've never looked inside a WK's engine bay...so I'm not sure....how bout you take a pic if you can please...that way I'll be able to better tell...where does this fan sit? Right in front of the clutch fan, or to the side?

On my dad's Hemi Ram, he has a secondary fan that only cools the AC's radiator...and it's only on when the AC is on...
The fan turns on with the a/c. This fan has also turned on low speed as well as high speed during really hot days idling in my driveway without the a/c on also to provide more cooling. I can take some snaps.
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  #79  
Old 09-30-2009, 08:39 PM
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Re: 180 degree T-stat

Pics 2006 4.7L WK cooling system (fans)

1. belt driven clutch fan location




2. Pics from under the jeep looking up into the engine bay of auxiliary cooling fan.






Hope this helps Hannes
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  #80  
Old 09-30-2009, 08:48 PM
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Re: 180 degree T-stat

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Originally Posted by mjl2610 View Post
Well yeah i mean i guess but the problem still lies in letting the computer turn it on at 195 or 210* versus you flipping a switch.

I had been thinking that our Jeeps have to have relays to turn the fans on and off. So i did some searching and came on this saturn forum at this link, ( http://www.saturnfans.com/forums/sho...t=23668&page=3 ) post 44, where a guy posts up a drawn schematic of a switch that will turn the relay on and or off thus activating his cooling fans. Possibilities here?
I can't vouch for the WK's setup, but on the WJ, because the hydro fan is running off of fluid being driven by the PS pump. Because of this, regardless of engine temp, the fan is always spinning at a low speed. On the stock PCM calibration, it will go into the high speed setting at 220* F.

The high speed setting can be manipulated through PCM programming. You could also bump up the idle to spin the pump slightly faster....but it'd be more effective to somehow get a smaller pulley for the PS.
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  #81  
Old 09-30-2009, 08:53 PM
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Re: 180 degree T-stat

That will also change your pumps pressure which may negatively accfect your steering.
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  #82  
Old 09-30-2009, 09:08 PM
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Re: 180 degree T-stat

That definately helps Mike...thanks for the pix...I don't see why you wouldn't be able to run a toggle switch or something to that fan...looks electric to me...
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  #83  
Old 09-30-2009, 09:48 PM
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Re: 180 degree T-stat

Yeah i mean i want to look into it some more i might have some time this weekend. However, i don't see why a simple switch that completes a circuit to the relay wouldn't just force on any cooling fan regardless of its basis of operation.

As stock, the signal comes from the pcm and says hey fan turn on, and the relay gets that impulse and clicks on. The diagram, by faking that signal, should work for any setup in theory. Even for those who have the hydraulic system.
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  #84  
Old 09-30-2009, 10:12 PM
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Re: 180 degree T-stat

Quote:
Originally Posted by scjeep4.7HO View Post
That will also change your pumps pressure which may negatively accfect your steering.
That's the idea, to change the pumps pressure so the fan will spin faster.

it'd be not much different than turning while on the gas.
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