overheating
CF Veteran
Joined: Oct 2011
Posts: 4,440
Likes: 3
From: Seal Beach, CA
Year: 1996
Model: Cherokee
Engine: 4.0 HO Straight Six
Originally Posted by vip01hp2
New thermostat, the motor has about 30 miles on and takes about 20 minutes to start overheating.
CF Veteran




Joined: Nov 2010
Posts: 5,840
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
1. Be sure the water pump is the correct application. If the "rotation" is incorrect and there are similar applications that have a different rotation, it won't work properly.
2. If water pump is verified, radiator is suspect. And get a new radiator cap while you're at it.
2. If water pump is verified, radiator is suspect. And get a new radiator cap while you're at it.
Last edited by tjwalker; Apr 17, 2012 at 07:03 AM.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Only a rad shop can tell the internal condition of the XJ rad......by separating the tanks from the core. Rads usually fill/clog from the bottom up, a row at a time. Flushing will seldom remove solid sediment/rust from the rad. Flushing with a hose can appear like water is flowing freely thru the rad and it probably is.....but it's probably only flowing thru the top half of the rad. The XJ rad is small.....1/2 of a XJ rad is realy small.
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