Sep 21, 2015, 03:49 PM
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XJ Ask the Question Thread
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 740
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
My temp runs really low pretty regularly. Like 30-40° under. But on the highway, sometimes, it'll climb and approach 270°. It'll drop back to around 230° and turning on the defrost at that point will range anywhere from no change to 190°.
I already replaced one sending unit, but I can't verify this one's accuracy while driving. I don't know if I have a cooling problem, a bad sending unit, an electrical problem, or a bad gauge
I already replaced one sending unit, but I can't verify this one's accuracy while driving. I don't know if I have a cooling problem, a bad sending unit, an electrical problem, or a bad gauge
Last edited by NewKindOfClown; Sep 9, 2016 at 11:13 PM.
No, I don't lick fish.
Joined: Mar 2011
Posts: 11,169
Likes: 26
From: Northern Kentucky
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
My temp runs really low pretty regularly. Like 30-40° under. But on the highway, sometimes, it'll climb and approach 270°. It'll drop back to around 230° and turning on the defrost at that point will range anywhere from no change to 190°.
I already replaced one sending unit, but I can't verify this one's accuracy while driving. I don't know if I have a cooling problem, a bass sending unit, an electrical problem, or a bad gauge
I already replaced one sending unit, but I can't verify this one's accuracy while driving. I don't know if I have a cooling problem, a bass sending unit, an electrical problem, or a bad gauge
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
It has a new cap from when I was diagnosing the original bad temp sending unit. Wonder if maybe it's faulty or if the overflow hose is blocked...
CF Veteran
Joined: Jan 2013
Posts: 19,219
Likes: 45
From: west chester, pa
Year: 1999
Engine: 4.0
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Only thing that should keep it from cooling at highway speeds would be the coolant flow totally stopping or the thermostat blocking it.
That said, if your coolant actually got to 270F, you'd be having some serious problems.
Your YJ is OBD-I, right? There should be some way to pull temp from the PCM... somehow...
That said, if your coolant actually got to 270F, you'd be having some serious problems.
Your YJ is OBD-I, right? There should be some way to pull temp from the PCM... somehow...
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Only thing that should keep it from cooling at highway speeds would be the coolant flow totally stopping or the thermostat blocking it.
That said, if your coolant actually got to 270F, you'd be having some serious problems.
Your YJ is OBD-I, right? There should be some way to pull temp from the PCM... somehow...:
That said, if your coolant actually got to 270F, you'd be having some serious problems.
Your YJ is OBD-I, right? There should be some way to pull temp from the PCM... somehow...:
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Crappy ground?
No, I don't lick fish.
Joined: Mar 2011
Posts: 11,169
Likes: 26
From: Northern Kentucky
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
