Grand Cherokee 1998 5.9 -
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The Original 3/8" Ruffstuff Diff Cover!Ruffstuff Axle Simple Swap Kit!The Ruffstuff NOT Universal 4 Link Kit!

Unread 04-19-2012, 12:16 PM   #1
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1998 ZJ 
Join Date: Oct 2011
Location: NYC, NY
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Grand Cherokee 1998 5.9

My 5.9 has been in the family since new and I am the second owner. I have installed new front and rear axles, ball joints, shocks, brake rotors, calipers, pads, after market front and rear sway bars...power steering pump,on and on. However there is one small item that I have yet to be able to solve, maybe there are some clues you guys can provide??

I have replaced the "Coolant Temp Sensor" due to the warning that is displayed on my info display. The problem I a having is that I have had to replace it THREE times and keep getting the warning that it is bad.

I have the Factory Service manual for 1998 that covers the 5.9 engine, so I have researched but I am still at a loss as to what I should do next...ANY HELP is APPRECIATED!

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Unread 04-19-2012, 12:21 PM   #2
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1998 ZJ 
Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Posts: 6,953
VIC can throw random warnings even though there's nothing wrong with the things it monitors... I get a rear light failure warning every time I fire up the Jeep and hit the brakes the first time - all my rear lights work perfectly fine. Coolant temp sensor warning I believe is one of the most common ones you will see.

Just ignore it, if you get annoyed by the beeps VIC makes, unplug it and be happy with it. I'm sure there is a way to fix it the right way, but I have no idea if it's easy or cheap - or not. I can live with the beed it makes the first time I hit the brakes, but if my VIC starts giving more false alarms, I'll probably just unplug it.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 04-19-2012, 12:26 PM   #3
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1997 ZJ 
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Might be a loose solder on the VIC board. You can pull it and look it over, touching up solder points.
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Unread 04-19-2012, 12:29 PM   #4
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1998 ZJ 
Join Date: Dec 2008
Location: Exeter, RI
Posts: 7,284
Coolant sensor bad is a well know problem. I have yet to see a GC of that vintage that did not have the "bad coolant sensor". Somebody already mentions the problem is causes by failed solder connection in the VIC. There are many write-up on the fix.

I've just been living with the annoying beeping for the past 14 years.
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Unread 04-19-2012, 01:27 PM   #5
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1998 ZJ 
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Mine isn't broken yet but I'm pulling the vic out anyways to replace it with some switches and gauges. It's the vic, your truck is fine.
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Unread 04-19-2012, 01:31 PM   #6
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1998 ZJ 
Join Date: Feb 2006
Location: . . . . . . . . . . . . . . . A shining city upon a hill
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As mentioned, many threads regarding this. Here's one:
"Those who hammer their guns into plows, will plow for those who do not." -Thomas Jefferson
'98 ZJ Laredo 5.2 Selec-Trac (249 to 242 swap)
'05 KJ Limited 3.7 Selec-Trac
'94 ZJ Limited 5.2 Q-Trac- sold, after 17 years
'67 International Harvester Scout 800; 345ci V8,T18 4spd, Dana 20 TC
'06 Chrysler 300C SRT8 6.1L
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Unread 04-21-2012, 12:40 PM   #7
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1996 ZJ 
Join Date: Feb 2011
Location: Farmington, MN
Posts: 593
And it's companion.
'96 Grand Laredo, 4.0, Stock, Daily Driver

I fought Oracle and Oracle won!

Originally Posted by coralman
If the faith isn't there,the doubt is.
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