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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > "Coolant Sensor Bad" FINALLY FIXED!!!!

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Unread 08-05-2013, 10:24 PM   #121
Snowfan2
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1998 ZJ 
 
Join Date: Jan 2012
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Quote:
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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Unread 09-25-2013, 07:21 AM   #122
jmcgxx
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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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Unread 10-08-2013, 02:28 PM   #123
coldiron44
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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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Unread 10-08-2013, 05:13 PM   #124
Smokey1r
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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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Unread 10-17-2013, 01:15 AM   #125
TomTechy
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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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Unread 03-11-2014, 08:54 PM   #126
97LMTDORVIS
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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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Unread 03-11-2014, 09:02 PM   #127
kg6mov
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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.

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Unread 04-22-2014, 08:36 AM   #128
ZJJay
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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.
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Unread 04-22-2014, 10:27 AM   #129
jeepjeepster
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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.
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Unread 06-30-2014, 09:16 AM   #130
Tailspin57
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Quote:
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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Unread 06-30-2014, 12:17 PM   #131
coralman
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Amen
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Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page
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Unread 07-01-2014, 08:38 AM   #132
jeepjeepster
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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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Unread 07-01-2014, 09:08 AM   #133
McCloudsZJ
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Quote:
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.

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Unread Yesterday, 12:51 PM   #134
TerryMK
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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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