"Coolant Sensor Bad" FINALLY FIXED!!!! - Page 9 - JeepForum.com

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post #121 of 140 Old 08-05-2013, 10:24 PM
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Originally Posted by KoreaZJ View Post
For testing... Coolant Sensor can be replaced with a 3.3KΩ resistor. If the message is still there, then likely VIC solder joint(s). Fractured solder joints may not be easy to see, even with a magnifier.

I found several fractured solder joints, the main ground pin solder was worst. I resoldered every pin in both rows.

Great pic KoreaZJ, thanks.

Fixed mine yesterday, no more beeps. Nice.

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post #122 of 140 Old 09-25-2013, 07:21 AM
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Coolant Sensor bad

One more huge thanks to phild328 for his help with repair of my VIC solder connection.
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post #123 of 140 Old 10-08-2013, 02:28 PM
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Coolant sensor light and alarm

For my '97 GC, phild328 was on the money. I followed his directions and sure enough, found bad soldering in several connections including the one for the coolant sensor in the overflow tank. Checked the resistance at the places noted before taking out the VIC. A few cents worth of solder and about an hour of work and it's fixed. Thanks.
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post #124 of 140 Old 10-08-2013, 05:13 PM
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Its always a good idea to just reflow all of the pins on that connector, that way the joints are all refreshed and ready to go for another decade or more.
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post #125 of 140 Old 10-17-2013, 01:15 AM
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For my 1996 Grand Cherokee, Thanks to phild328 for this solution, it solved my bogus and annoying "Coolant Sensor bad" message. The solder joints on 4 pins of the my connector were just slightly fractured as in the picture provided by KoreaZJ. I re-flowed solder on all of the pins on that connector... no more bogus alarms.
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post #126 of 140 Old 03-11-2014, 08:54 PM
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Hope this works some times I just want to rip out the VIC and hammer it to death gonna check it all out in the a.m.
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post #127 of 140 Old 03-11-2014, 09:02 PM
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Yep, I did it to the niner last I had the dash apart, you'll be able to see the bad solder joints.

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
1984 F250, 460 BB, T19, work truck/future tow pig
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Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #128 of 140 Old 04-22-2014, 08:36 AM
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Yep, it's fixed!

I finally made time to remove the VIC. I had a friend reflow the solder connections as I didn't have a soldering iron small enough. (Darn, those pins are SMALL!) No error message since. Thanks to the OP and everyone else for their input.

'96 ZJ, 4.0L, 42RE, NP242, stock D30 and D35-LS w/ 3.73, 4-1/2" lift, 32" BFG ATs, Magnaflow, JKS track bars and disconnects, spare tire carrier, Optima red top, ROLA roof rack, KC SlimLite driving lights, CB and Yaesu ham radios, GPS
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post #129 of 140 Old 04-22-2014, 10:27 AM
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Im not entirely sure if mine had cracked solder joints but I resoldered all of the joints. Mine ended up actually being a bad coolant sensor.

Does anyone know why the FSM shows the 4.0 having an oil level sensor but it doesn't? That would've been kinda neat.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #130 of 140 Old 06-30-2014, 09:16 AM
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Originally Posted by Kruzin View Post
Doncha just love it when a 3 year old thread get resurected, and ppl act like it's new info
Some people act like its new info because:
-they just bought a Jeep
-have the same problem
-surfed the web for a solution
-joined this wonderful form
-found a solution
-and like me, it is the first time they visited the form making it “new info” to me

PS you misspelled “resurected” (you forgot an “r”)

Last edited by Tailspin57; 06-30-2014 at 09:29 AM.
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post #131 of 140 Old 06-30-2014, 12:17 PM
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Info on projects and repairs categorized by system

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #132 of 140 Old 07-01-2014, 08:38 AM
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I think its a good thing that people do some research. I often times enjoy reading old threads when people bring them back from the dead. More so if its a good write-up or build thread.

Its a nice surprise to have a 10 page build thread popup to read through. Almost like an accidental fart that brightens up your day. Pop, there it is.

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1998 ZJ 5.9 w/65,155 mi Slate Black
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post #133 of 140 Old 07-01-2014, 09:08 AM
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Originally Posted by jeepjeepster View Post
Almost like an accidental fart that brightens up your day. Pop, there it is.

This post brightened up my day. I'm vehemently opposed to retaining the VIC, but this thread is a good resource for people that don't feel the same way I do.

March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
In the garage: M1 4bbl
In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys
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post #134 of 140 Old 09-21-2014, 12:51 PM
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Thanks for the info

I've had this problem intermittently for several months. I found there were 5 solder posts on the connector that had visible fractures. I also had a surface month resistor that had visible corrosion on the solder. I re-flowed all the connector posts and the resistor and the problem is gone.

A couple years ago I had a problem with the dash lights going out intermittently. This turned out to be a similar solder fracture problem on the headlight/dimmer unit on the left side of the dashboard.
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post #135 of 140 Old 12-16-2014, 01:58 PM
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where is the coolant temperature sensor for grand Cherokee 201
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