4.0l XJ overheating? Start here - the basics! - Page 9 - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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
  #73  
Old 28-03-2014
Oli-dogg's Avatar
Oli-dogg  Oli-dogg is offline
Full Flexer
 
Join Date: Apr 2009
Location: Port Stephens, NSW
Posts: 588
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Default

Speaking of regular flushing and engine block scale...

When I was chasing an overheating problem my XJ was running hot around town and on the freeway, sitting at 105*C instead of 95*C, even hotter uphill. I replaced the whole cooling system one part at a time including the radiator, viscous fan clutch, fan belt, thermostat and housing, temp sender, water pump, coolant, upper and lower radiator hoses, radiator cap, tested the thermo fan, flushed the radiator and engine block, replaced the muffler and checked for exhaust blockages. Nothing made any difference so I suspected a blown head gasket but there were none of the usual signs…no white smoke, bubbles in the radiator, or contaminated oil or spark plugs etc.

A friend offered to pull the tank off my old radiator and take a look inside to see if there were any blockages. I doubted it would be a radiator problem because I’d only just replaced it with a near new radiator from another XJ (both Adrad brand) and when I flushed both radiators out the water was clean. The attached photos show what was inside my radiator. It was 25% blocked with scale and silicon!

We gave it a good clean and put it back in my Jeep and I gave the a/c condenser a blast with the high pressure hose while the radiator was out. I was surprised at the amount of dirt that came out of it considering I always give it a spray through the front grill after each trip. My XJ’s running cool again now so the problem was the clogged radiator core or a dirty a/c condenser, or a combination of the two. It turns out the near new radiator I used only had 27 tubes compared to the 39 tubes my old radiator had. The owner of the newer radiator said it was an Adrad brand so I just assumed it would be the same as mine, it wasn't.

If you have a blocked radiator you might not be able to tell because as I discovered even flushing it out with a hose didn’t get the crap out of the tubes, and the water looked clean. I'll definitely be flushing it out more regularly in future and I'll be a bit more careful with the amount of silicon I use on the water pump and thermostat housing!
Attached Thumbnails
Click image for larger version

Name:	TooHot.jpg
Views:	126
Size:	18.8 KB
ID:	67217   Click image for larger version

Name:	1743583_612158355524379_398964879_n.jpg
Views:	142
Size:	55.1 KB
ID:	67218   Click image for larger version

Name:	1797611_612158332191048_1998391003_n.jpg
Views:	122
Size:	58.4 KB
ID:	67219   Click image for larger version

Name:	1656056_612158388857709_525663253_n.jpg
Views:	150
Size:	54.1 KB
ID:	67220  

Last edited by Oli-dogg; 28-03-2014 at 03:44 PM.
  #74  
Old 28-03-2014
bruggz351's Avatar
bruggz351  bruggz351 is offline
SpicerSlicer
 
Join Date: Jun 2009
Location: Casino
Posts: 5,548
What Jeep do I drive?: XJ
Likes: 5,510
Liked 1,325 Times in 717 Posts
Default

Siliworms!!!

I haven't used silicon on my motors for I don't know how long. For that very reason.
And now, because of sensors also, although sensor safe sealants are available now.

cheers
__________________
  #75  
Old 29-03-2014
sbk930's Avatar
sbk930  sbk930 is offline
I just registered
 
Join Date: Sep 2010
Posts: 13
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Check out my Ride(s)
Cool

Hello fellow XJers

first post!

Regarding the overheating issues with the XJ, I must say I have never been as frustrated with a problem as I am with this. It truly is an XJ thing.

Following are my mods to overcome this issue:

NEW:- upper radiator hose
lower radiator hose
thermostat housing
thermostat
water pump
vented bonnet
bonnet lift
2core radiator
with 3 shrouded electric fans
flushed numerous times and always been clean when done
pressure tested and checked for carbon in system - no issues there
30/70 coolant/demineralised h2o
stainless extractors
cold air intake

There are no leaks, no air in the system, belt is fine, pump runs well, the three fans pull like a cyclone and guess what?

IT STILL IS OVERHEATING - ahrrrrrrrrrrr

talk about frustrating.
  #76  
Old 29-03-2014
junglejuice's Avatar
junglejuice  junglejuice is offline
MonsterMoose
 
Join Date: Nov 2003
Location: Brisbane, Southside
Age: 46
Posts: 10,545
What Jeep do I drive?: XJ
Likes: 355
Liked 1,091 Times in 680 Posts
Default

What temp is it running at?

Have you cleaned the AC core as well as the radiator core to ensure good airflow?

When you flushed the system did you use a quality chemical flush?
__________________
JJ
10'000 Club

Do it once, Do it right!

95/97 hybrid
IRO/OME/JK 2" lift
IRO SYE
ARB bar
Sponsored Posts
  #77  
Old 29-03-2014
sbk930's Avatar
sbk930  sbk930 is offline
I just registered
 
Join Date: Sep 2010
Posts: 13
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Check out my Ride(s)
Default

hello junglejuice

On a good climb it will boil, on a soft climb on a hot day it will boil.

I end up stopping and let it idle until it cools. With all fans running it cools fairly quickly. The radiator is pretty much new so no obstructions there and I do not run an air con, however I am thinking of using the compressor for on board air. The trans cooler is new and clean as I do not run it through the radiator.

I am stumped.
  #78  
Old 29-03-2014
Oli-dogg's Avatar
Oli-dogg  Oli-dogg is offline
Full Flexer
 
Join Date: Apr 2009
Location: Port Stephens, NSW
Posts: 588
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Default

Quote:
Originally Posted by sbk930 View Post
The radiator is pretty much new...
I'd still be trying another radiator, preferably an Adrad #JEE9001.C/A2 with the extra tubes.

http://www.go.jeep-xj.info/HowtoRadiatorFitting.htm
Sponsored Posts
  #79  
Old 31-03-2014
sbk930's Avatar
sbk930  sbk930 is offline
I just registered
 
Join Date: Sep 2010
Posts: 13
What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
Check out my Ride(s)
Default

Hi Oli-dog

Did an ebay search and found the radiator I installed it is an FF Dynamics triple threat, item no.161185791684

Today I installed high density foam around the radiator and between the grill so all air has to be directed entirely through the radiator.

Willing to try anything.
  #80  
Old 01-04-2014
94xjeep  94xjeep is offline
Established Member
 
Join Date: Nov 2007
Location: Howlong NSW, on the Murry
Posts: 120
What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 4 Posts
Default

hi there again, Don't use ultra blue sealant or silicon.
I only use gasket cement 3 pond or the Holden head stud sealant in a small can. Repco sell it put it is a little pricey but will last a lift time if stored properly. It's yellow 3 bond and the holden stuff a little lighter. Remember every time you boil the engine the scale will transfer into the rh radiator tank. Steam is the best cleaner.
  #81  
Old 29-06-2014
94xjeep  94xjeep is offline
Established Member
 
Join Date: Nov 2007
Location: Howlong NSW, on the Murry
Posts: 120
What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 4 Posts
Default

HI RHD drive XJ's have the engine fan as we know on the outlet end of the radiator so as they heat up at low speeds half the core is only doing the job till the little fan cuts in at about 107 Degrees I think and it has to deal with the HOT coolant from the engine first. This little fan is flat out doing this. The engine fan is clutch type and it's only as good as the core. If the core is blocked opposite the bimetal spring then it will not engage and spin at engine speed. Remember the thicker the core the more aggressive(pitch and speed) the fan must be pull air through the core. It's now more of a restriction at lower speeds. They can also block up with debris quicker to as the air speed is slower through the core. Less core(rows) and less fins per inch keep air speed up (velocity) to help blow the dust through the core. It's like a good vacuum cleaner to one with a blocked bag, the core is the bag.
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 02:25 PM.




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 - 2019, vBulletin Solutions, Inc.

AJOR 2002 - 2019 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.ausjeep.com www.ausjeep.com.au www.midlifemate.com ausjeepforum.com Jeep Wrangler JL Australia release
vB Ad Management by =RedTyger=