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  #10  
Old 02-03-2011
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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.
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  #11  
Old 02-03-2011
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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.
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Last edited by carvesdodo; 03-03-2011 at 12:52 PM.
  #12  
Old 02-03-2011
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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!!!
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  #13  
Old 03-03-2011
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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 08:07 PM.
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Old 03-03-2011
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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!
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  #15  
Old 03-03-2011
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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 06:51 PM.
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Old 03-03-2011
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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....
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  #17  
Old 03-03-2011
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Default 50/50 ... 30/70

Good point Rodge .....

Generally the mix is referred to as eth-gly/water .... so 30/70 is 30% eth-gly.

But it only needs to be written or referred to once ... in the reverse - and its all out the window.

The ratio numbers have no real reference to the anti-corrosive additives, coz thats measured in teaspoons/tablespoons/whatever .... per litre of mix .... regardless what the mix ratio is.

Which coolant grade to use ... and even which type is a drivers choice depending on what they know or whether they are warranty bound.

There is 4 sources of anti-freeze mix info ... Ooooops ... 5 sources ... thanks Nakkas ...

First is all the knowledge, beliefs, experience, opinions, facts AND fairy tales on car forums,
Second is the "our coolant is special" drivel from the car manufacturers,
Third is what the "coolant" manufacturers will tell you before getting to the point of upsetting the carmakers,
Fourthly there is the coolant scientific community ... who dont seem to give a toss who they upset when quoting facts and figures ... Coz they are always right ...
And lastly there is all those unchallangeable private websites with all their right AND wrong info.

I like to jumble it all together for a balanced view ....
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Last edited by carvesdodo; 03-03-2011 at 07:36 PM.
  #18  
Old 03-03-2011
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Quote:
Originally Posted by XJeepers View Post
And this is just as relevant.... lighten up



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.
yes that is relevant in regards to % of coolant mix but as i said what the ****** has a rego plate got to do with cooling problems unless it blocks air flow
that post is just bull before giving me the toilet have a look at post # and join dates of people it
usually means something we have had a couple of realy cluee people leave becuase of the of topic crap that gets dumped in tech threads
by the way i have over 30 years of jeep experience under my belt
and over 35 years fab experience as well


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