Over heating in 4wd!
#1
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 47
Likes: 0
From: Colorado Springs, CO.
Year: 1993
Model: Cherokee
Engine: 4.0 in-line
Over heating in 4wd!
Ok. I got the Tank on a 4WD road covered in river rock last weekend, and put him in 4H then 4L and within 10/15 min of both, the temp light was on and the coolant reservoir was boiling over! But I had no problems going over passes at 70+ mph for 3 hours on the way home. What gives?
Any thoughts?
Any thoughts?
#2
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
if you have no problems at 70,then either you have blockage on the inlet to the a/c cond,or the electric fan is not coming on,it is also possible the mechanical fan is not working good,it sounds like an air flow problem.
#3
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 47
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From: Colorado Springs, CO.
Year: 1993
Model: Cherokee
Engine: 4.0 in-line
It just started smoking a little too, so I opened the air filter and there is oil in it. the fans seem fine though. would a radiator flush possibly clear out the blockage?
#5
Member
Joined: Feb 2009
Posts: 158
Likes: 2
From: Conroe, Tx
Year: 1996 & 2001
Model: Cherokee (XJ)
Engine: 4.0
Try checking air flow threw the A/C coil and radiator coil and fan clutch going bad. I am thanking like mixed89 it a air flow problem. Being it happen at very slow speeds
#6
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
when you say you have one fan,you mean you have the mechanical fan right,and you do not have the electric fan? you are suppose to have both fans,if you do not,that is your problem.
#7
CF Veteran
Joined: Aug 2008
Posts: 6,588
Likes: 494
From: Chico, CA
Year: 1986
Model: Cherokee
Engine: 4.3L with headers and full 3" exhaust system
X2 The electric fan will come on and give more cooling. Your mechanical fan only covers half of the long skinny radiator. It works OK at 70 mph because the air is pushed through uniformly at a higher rate than the fans can do anyway and all the way across the radiator. Make sure that when you are done, you have shrouds for both fans.
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#8
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 47
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From: Colorado Springs, CO.
Year: 1993
Model: Cherokee
Engine: 4.0 in-line
I figured the speed helped with the airflow but I wasn't sure about the second fan. The driver side half of the radiator does not have a fan.
#9
Seasoned Member
Joined: Jun 2009
Posts: 287
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From: Royal Oak, MI/Higgins Lake, MI
Year: 1997
Model: Cherokee
Engine: 4.0 liter H.O. I-6
#12
Registered Users
Joined: Mar 2009
Posts: 1,401
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From: Pa
Year: 1998
Model: Cherokee
Engine: 4.0
Ok. I got the Tank on a 4WD road covered in river rock last weekend, and put him in 4H then 4L and within 10/15 min of both, the temp light was on and the coolant reservoir was boiling over! But I had no problems going over passes at 70+ mph for 3 hours on the way home. What gives?
Any thoughts?
Any thoughts?
#14
Seasoned Member
Joined: Jun 2009
Posts: 287
Likes: 0
From: Royal Oak, MI/Higgins Lake, MI
Year: 1997
Model: Cherokee
Engine: 4.0 liter H.O. I-6
I found that some of the aftermarket fans did not have enough pulling power to keep the engine cool. I ended up replacing my bad e/fan after several attempts with different aftermarket fans with a stock e/fan from another XJ in the jy. I would just try and get a replacement stock e/fan. unless someone else knows of a good aftermarket fan??
#15
Junior Member
Joined: Aug 2009
Posts: 81
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From: greenville, tx
Year: 1998
Model: Cherokee
Engine: 4.0