NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old September 9th, 2004, 04:15
Kevin Kevin is offline
NAXJA Forum User
 
Join Date: Oct 2002
Location: Richmond, VA
Posts: 92
Aux. Electric Fan Override?

Has anyone tried to do this? If I understand correctly, the electric fan comes on when the engine temp exceeds a certain point. I was wondering if it is possible to bypass the relay that does this and just put a toggle switch in parrallel to the relay. That way, if I wanted the fan on when crawling, I could stay ahead of my overheating temps, and if I had the switch off, the relay could still do its thing. Will this work?
Reply With Quote
  #2  
Old September 9th, 2004, 05:04
badexpresso badexpresso is offline
NAXJA Forum User
 
Join Date: Aug 2004
Location: MN
Posts: 15
Re: Aux. Electric Fan Override?

Well, i haven't looked to extensively into the jeeps, but on the neons they have a fan relay control circuit (solid state) and the pcm grounds the relay for the fans to turn on. Depending on how much time they are grounded depends on how many volts the fans get. If the pcm grounds the fans for say 30% of the time, they only get a small voltage (say 4 volts) so they run very slowly, and when the pcm grounds the fan relay 100% of the time, the fan runs 100% of speed.

Did I answer your question? It should work, but you have to figure out the fan control relay or run a normal relay the would trigger the fans to run.
Reply With Quote
  #3  
Old September 9th, 2004, 07:02
bj-666's Avatar
bj-666 bj-666 is offline
NAXJA Forum User
 
Join Date: Apr 2004
Location: Rhode Island
Posts: 1,300
Re: Aux. Electric Fan Override?

if you do a search on this you will find lots i just saw a post about it a few weeks ago and they do sell a plug in kit all set to go that does just what you said
Reply With Quote
  #4  
Old September 9th, 2004, 07:07
juicexj24 juicexj24 is offline
NAXJA Forum User
 
Join Date: Apr 2003
Location: USA
Posts: 1,201
Re: Aux. Electric Fan Override?

go to www.xj-armor.com and take a look at their kit. They have some photos which should help you in making one or just buy theirs, the price is pretty cheap and it comes complete with everything pre-wired up with a switch. I have it on mine and it was a simple plug and play kind of thing. Juice
Reply With Quote
  #5  
Old September 9th, 2004, 07:18
jrsxj98's Avatar
jrsxj98 jrsxj98 is offline
DILIGAF
 
Join Date: May 2004
Location: Crawlorado
Posts: 2,098
Re: Aux. Electric Fan Override?

You can by one from xjarmor on ebay for 36.00 comes with oem style plugs, relay, and switch.
Reply With Quote
  #6  
Old September 9th, 2004, 07:25
FELIX's Avatar
FELIX FELIX is offline
Who Knows, Ask Who
 
Join Date: Aug 2003
Location: Camarillo, CA
Posts: 653
Re: Aux. Electric Fan Override?

Go to Radio Shack, & pick out a switch you like, some hook up wire, & a fuse adapter. Then just bypass everything & wire it straight to the fuse box. Then you decide when the fan comes on. Probably cost you $10-$15

Rob
Reply With Quote
  #7  
Old September 9th, 2004, 10:03
John90XJ John90XJ is offline
NAXJA Forum User
 
Join Date: Feb 2003
Location: Reno, NV
Posts: 969
Re: Aux. Electric Fan Override?

When I did the closed cooling system upgrade to an open system, I lost the bung for the fan switch. I cut the wire off the factory automatic switch, ran wires to a switch on the dash and now control the fan from the dash at my convenience. It still comes on automatically when using the A/C. 3 years and 100k miles later and it still works fine.
Reply With Quote
  #8  
Old September 9th, 2004, 11:13
Planetcat Planetcat is offline
NAXJA Forum User
 
Join Date: Sep 2003
Location: NorCal
Posts: 447
Re: Aux. Electric Fan Override?

I have my aux fan on a toggle on my '96. It will come on three ways (a) via toggle, (b) via AC on, or (c) when engine temps reach 208*. Tap into white wire with a splice connector, so you don't have to cut any existing wires. Run it to a relay under the hood. Power the relay to (+) battery, ground relay to something metal, and run relay to toggle inside jeep. A toggle, relay, wires, and connectors will cost you about $15 at Pep Boys. If you're not sure how to hook up the relay, get a kit - it'll have instructions. It'll be a sweet setup and will allow the fan to come on with the toggle off via the ECU, in case you're too preoccupied wheelin' to flip the switch. LOL.
Reply With Quote
  #9  
Old September 9th, 2004, 11:24
jeepguy97's Avatar
jeepguy97 jeepguy97 is offline
On a Time Out
 
Join Date: Aug 2003
Location: clearfield, pa
Posts: 1,271
Re: Aux. Electric Fan Override?

The kit from XJ armor only works for post '97 XJs. The connectors wont hook up to 97 and later style.
Reply With Quote
  #10  
Old September 9th, 2004, 12:07
dmillion dmillion is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Colorado
Posts: 605
Re: Aux. Electric Fan Override?

"The kit from XJ armor only works for post '97 XJs. The connectors wont hook up to 97 and later style."

Huh? I think you've got a typo there somewhere. Does it work for '97 and later, or for PRE '97 models?
Reply With Quote
  #11  
Old September 9th, 2004, 12:07
juicexj24 juicexj24 is offline
NAXJA Forum User
 
Join Date: Apr 2003
Location: USA
Posts: 1,201
Re: Aux. Electric Fan Override?

Ya it does work for the pre 97's but you can switch the plugs out to fit the newer XJ's.
Reply With Quote
  #12  
Old September 9th, 2004, 13:54
THE NEWF THE NEWF is offline
NAXJA Forum User
 
Join Date: Jun 2004
Location: Newfoundland
Posts: 52
Re: Aux. Electric Fan Override?

I cut the wires on the fan, put in an in-line fuse and ran a switch to my dash, cost me $11 Canadian and works great! Bought the switch, fuse holder, and 14 gauge wire at Car Quest!
Reply With Quote
  #13  
Old September 9th, 2004, 14:38
jeepguy97's Avatar
jeepguy97 jeepguy97 is offline
On a Time Out
 
Join Date: Aug 2003
Location: clearfield, pa
Posts: 1,271
Re: Aux. Electric Fan Override?

I meant the kit only works for PRE 97 XJs. Yes its true you can vut the wires and modify it but their website says fits all XJs 1984-2001. I just wanted everyone to know that in the form you recieve it it will not just hook right up to post 97 XJs.

A side note: For non-Renix XJs, (ones without the temp sensor mounted in the radiator tank), the PCM controls the aux. fan and you must run a relay and a switch to avoid sending 12 volts back to the PCM.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Electric Fan Override reson46 OEM Tech Discussion 14 June 10th, 2009 01:58
XJ Aux Cooling Fan (electric) Trail-XJ Wanted: Private Party Only 0 May 17th, 2004 13:55
Please help me with this aux fan switch before I light my POS Jeep on fire. Pics! 90Pioneer Modified Tech Discussion 12 May 15th, 2004 20:53
Aux. Electric fan switch wiring? Dazz Modified Tech Discussion 19 March 20th, 2004 23:58
Aux. Fan Works Only w/ AC?? DaveWV OEM Tech Discussion 5 April 5th, 2003 00:17


All times are GMT -7. The time now is 04:47.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014