4.0l XJ overheating? Start here - the basics! - Page 2 - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

SBR Offroad
Find out how to advertise on Ausjeep?

Go Back   AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand > JEEP GARAGE > XJ / MJ Cherokee


Portal Register Forums Trading Your Jeep New Garage Mark All Read

Post New Thread  Reply
 
Thread Tools Search this Thread
  #9  
Old 02-03-2011
ozjeepster's Avatar
ozjeepster  ozjeepster is offline
It's a JK Thing ;)
 
Join Date: Jan 2010
Location: Coffs Harbour
Posts: 1,173
What Jeep do I drive?: JK
Likes: 177
Liked 105 Times in 64 Posts
Default

I drove my xj into the workshop at lunch & hooked her up to the jeep Techconnec just to run her numbers & check for any ecm pcm updates & low & behold what popped up HIGH AMBIENT OR HOT SOAK TEMPERATURES 2000 - 2001 XJ its a software update that lowers the temp threshold used to determine when the engine fans are turned on , Cooling fans will cycle more often .

Service Bulletin 18-031-03 18-039-03

Ran the PCM update & my thermos used to come on at 104 c to 105 c now they come on at about 98c or by the temp gage a needle width before 100c & thats where it stays , im pretty happy with that , but i have also just fully replaced all the cooling system & removed the AC gear so i have greater air flow through the front so it may vary a little from Jeep TO Jeep

PCM update & re-program is for 4.0 ltr Auto's only


Top work there Rodger , cant wait to read the followups & sorry for the little Hijack but i thinkk it may also help the update xjer's

Last edited by ozjeepster; 02-03-2011 at 06:54 PM.
  #10  
Old 02-03-2011
Rodgebone's Avatar
Rodgebone  Rodgebone is offline
AJOR Gold
 
Join Date: May 2006
Location: Ocean Reef, Western Australia
Age: 54
Posts: 3,870
What Jeep do I drive?: XJ
Likes: 2
Liked 30 Times in 20 Posts
Default

excellent comments and rebuttals guys! exactly why i encouraged it (dont worry Carves, your opinions are safe - everyone has one so always share). I just thought it would be nice to have this discussion which has been beat to death countless times in one place: RIGHT HERE! i wont hold my breathe but maybe it will slow down the repeat questions we all get. sometimes i wish i had a stamp when answering them lol.
__________________
there's Only One
  #11  
Old 02-03-2011
carvesdodo  carvesdodo is offline
No Winching
 
Join Date: Jan 2008
Location: N.S.W.
Posts: 2,961
What Jeep do I drive?: XJ
Likes: 19
Liked 71 Times in 41 Posts
Default

Quote:
Originally Posted by Rodgebone View Post
...... (dont worry Carves, your opinions are safe - everyone has one so always share) ........
... Best I tie an icecube to my typing finger and get started then ...

Nahhhhh ... I'll be fairly shush on this thread .... as you covered most of my gripes & concerns at the start.


Quote:
Originally Posted by ozjeepster View Post
HIGH AMBIENT OR HOT SOAK TEMPERATURES 2000 - 2001 XJ its a software update that lowers the temp threshold used to determine when the engine fans are turned on , Cooling fans will cycle more often .

Service Bulletin 18-031-03 18-039-03
Can you use the techconnec thingy to find out whether that computer flash can be done on any OBDII 4.0l XJ here.

I mentioned it as only being suitable for the 2000/2001 in the other, general cooling thread last year, coz my local dealer reckoned it was year model specific .... but the dealers say a lot of things ....


Quote:
Originally Posted by junglejuice View Post
Interestingly in the 94-96 parts manual (my model) it lists only 2 thermostats, an unrated unit and a 180* (severe use) unit. Another interesting thing is my '95 model had a radiator in it specified for a '94 model and I thought it was alloy/plastic when in fact when I removed it recently I found that it was actually copper/plastic and had been there at least 8yrs as that is how long I have owned it and only once did I have an issue of overheating!!!!!
Best you check for belly dancers & camels under the backseat jj - as that was the stock radiator for the hot climate, saudi/middle east market ... was also available as a heavyduty cooling option elsewhere .... If the dealer knew about it

Should be in your parts book too.
__________________
I hate watching simplicity and reliability being ruined by bureaucracy and technology.

Last edited by carvesdodo; 03-03-2011 at 01:52 PM.
  #12  
Old 02-03-2011
junglejuice's Avatar
junglejuice  junglejuice is offline
MonsterMoose
 
Join Date: Nov 2003
Location: Brisbane, Southside
Age: 46
Posts: 10,543
What Jeep do I drive?: XJ
Likes: 355
Liked 1,089 Times in 679 Posts
Default

It was listed in the parts book, that is how I know it is from a '94 model, maybe this is part of the reason that I had so little cooling issues.....
Buggered if I know what thermostat is in it though as I have never checked..... oops!!!
__________________
JJ
10'000 Club

Do it once, Do it right!

95/97 hybrid
IRO/OME/JK 2" lift
IRO SYE
ARB bar
Sponsored Posts
  #13  
Old 03-03-2011
XJeepers's Avatar
XJeepers  XJeepers is offline
WELDING RODS FOR STEERING
 
Join Date: Apr 2010
Posts: 1,247
What Jeep do I drive?: JK
Likes: 267
Liked 214 Times in 120 Posts
Default

Quote:
Originally Posted by Rodgebone View Post
4.0L XJ OVERHEATING PART 1: START HERE - THE BASICS!
Maintain at least a minimum of 44% ethylene glycol and don’t EVER run straight water (except in emergencies).
Rodge, why the recommend minimum 44% mix? A lot a fellas are recommending and running 33% ratio for our hotter climate. A lot of engines, consisting of the same materials and marketed to Australia are running 33% and don't have any shorter life span because of it.

Last edited by XJeepers; 03-03-2011 at 09:07 PM.
  #14  
Old 03-03-2011
Rodgebone's Avatar
Rodgebone  Rodgebone is offline
AJOR Gold
 
Join Date: May 2006
Location: Ocean Reef, Western Australia
Age: 54
Posts: 3,870
What Jeep do I drive?: XJ
Likes: 2
Liked 30 Times in 20 Posts
Default

im not pissed off, was just a friendly reminder that we are discussing the xj 4.0L cooling system here - not other irrelevant stuff. adding those comments just makes it harder for folks to wade through the posts to get the info they really need. even my post here adds to it so i will state this one time only: lets stay on topic please. its all good so dont anyone stress over my comment!

as for the 44% figure - that is straight out of the FSM but as others have pointed out it may not be suitable for warmer climates. my choice has always been to run a 50/50 mix but that is just me. i suppose too it should be clarified what is 30% and what is 70% - the water or the coolant? lets make that distinction for those people who may not know (remember, this is an info page). also remember, my original post is PURELY my own opinion based on my own experiences and guided loosely by the FSM - i WANT you guys to share YOUR opinions and why you think they are plausible. That way a consensus might be formed based on shared experiences. if 30/70 works tell us why - i hear that number a lot too and may change my thinking if i hear a good reason for it. i guess also i am from a cold region so that number from the FSM rings true for my past experiences but like everyone, i learn something new everyday! suppose i should know better without being told but sometimes ya just go with what ya know! keep it coming guys!
__________________
there's Only One
Sponsored Posts
  #15  
Old 03-03-2011
SJCXJeep's Avatar
SJCXJeep  SJCXJeep is offline
CrawlerStar
 
Join Date: Aug 2010
Location: Gold Coast
Posts: 302
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Default

Thanks Rodge... great run down on one of the most commented/posted/talked about topics regarding the good O'll XJ... for a new comer to the brand of JEEP, its certainly great to read your experiences/comments... Ive changed most things on my cooling sys even putting in new welsh plugs when I got the jeep last year and shes running great here in hot/humid Brisbane..runs at 97deg in most instances, never goes over 105 in crawling daily traffic...I use a alloy friendly 50/50 mix of NULON ULTRA COOL.. it contains no Glycol. Its formulated to keep rust/scale /sludge/corosion and electolysis away... seems to work well.. I removed the bulky plenium chamber box that sits on the intake and fitted a older xj intake hose to stop heat soak, also removed the lower skid plate.

thanks
Steve

Last edited by SJCXJeep; 03-03-2011 at 07:51 PM.
  #16  
Old 03-03-2011
Nakkas's Avatar
Nakkas  Nakkas is offline
Symphony Composer
 
Join Date: Jul 2009
Location: Rockingham, WA
Posts: 638
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Default

Quote:
Originally Posted by murray View Post
this is why we have a problem here we have knoledgable people being pissed of by people posting totaly non relevent crap in the tech info threads
This is why I'm staying out of this thread from now on. We have stuffed a totally good piece of info and picked the crap out of it...

Nice try Rodge..

I was thinking I should post Rodge's thread on a web page like Go Jeeps, so it can't be cannon fodder....
__________________


XJ V8 Build
Electric water pump
Post New Thread  Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On


» Advertisements_AS2




Powered by vBadvanced CMPS v3.2.3



All times are GMT +10. The time now is 11:51 AM.




AJOR does not vouch for or warrant the accuracy, completeness or usefulness of any message, and are not responsible for the contents of any message. The messages express the views of the author of the message, not necessarily the views of AJOR or any entity associated with AJOR, nor should any advice be substituted as technical advice replacing that of a mechanic. You agree, through your use of this service, that you will not use AJOR to post any material which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, religious, political or otherwise violative of any law. You agree not to post any copyrighted material unless the copyright is owned by you or by AJOR. The owner, administrators and moderators of AJOR reserve the right to delete any message or members for any or no reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold harmless AJOR, the administrators, moderators, and their agents with respect to any claim based upon transmission of your message(s). The use of profile signatures to intentionally mislead or misdirect any member on this forum is not acceptable and may result in your account being suspended. Any trip that is organised through the AJOR forum is participated at your own risk. If you or your vehicle is damaged it is your responsibility, not that of the person that posted the thread, message or topic initiating the trip, nor the organisers of AJOR or moderators of any specific forum. This forum and associated website is the property of AJOR.





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

AJOR 2002 - 2018 AUSJEEPOFFROAD.COM. All corporate trademarked names and logos are property of their respective owners. Ausjeepoffroad is in no way associated with DaimlerChrysler Corporation or Fiat Jeep.
www.midlifemate.com wayalife.com jkwrangler.com ausjeepforum.com jk-forum.com canadianjeepoffroad.com cryptoprofitcalculator.net
vB Ad Management by =RedTyger=