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Unread 01-18-2011, 05:32 PM   #1
ckid222
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2001 XJ Cherokee 
 
Join Date: Mar 2010
Location: Allentown, Pa
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Temp gauge not working 89 yj

So title says it all. I searched on here and found a write up on how to clean up the circuit board (clock works now) but temp gauge not working. My question is Im pretty sure it worked before I nuttered could that have some thing to do with it? Also is there a way to test if the gauge itself is working? Any help would be appreciated. Thanks

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Unread 01-18-2011, 07:43 PM   #2
hh65pilot
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1989 YJ Wrangler 
 
Join Date: Apr 2009
Location: Corpus Christi
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Nutter bypass should not be a factor. My temp gauge was intermittent until I took the whole cluster out and ran additional grounding wires to all the nagative posts.
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Unread 01-20-2011, 07:29 PM   #3
Schaef81
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1990 YJ Wrangler 
 
Join Date: Mar 2010
Location: Lititz, Pennsylvania
Posts: 389
Easy way to test. If you have a voltmeter or any device where you can ground the wire to the block the gauge should go to 100% (fully right if sitting in the driver seat). My temp gauge too has gone out on me, just havent had the time to diagnose.
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Unread 01-20-2011, 08:10 PM   #4
Old4X
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1990 CJ7 
 
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Location: Ga
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When you were messing with the wires, did you disturb the temp gauge wire to the sending unit on the back of the head?

I was pulling wire over mine when I Nuttered, and it would be easy to knock it loose.
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Unread 02-03-2011, 09:20 PM   #5
ckid222
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Not sure, do you know what color the wire is or how would I identify it?
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Unread 02-04-2011, 07:20 AM   #6
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 17,610
This is the temp sensor. Remove the connector and see if the guage deflects. Short the wire to ground and it should go to 0. If it does then you need to replace the sensor. If it doesnt then post back.
temp-20sender-20outline-20img_9297.jpg  
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Unread 02-04-2011, 07:26 AM   #7
Berniebikes
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1988 YJ Wrangler 
 
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on my 88 it is a purple wire. look here



it runs to the little sensor on the rear of the block beside the valve cover
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Unread 02-04-2011, 07:30 AM   #8
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Same function. Do the test.
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Unread 12-31-2014, 02:39 PM   #9
timb24540
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I have an 89 YJ and same issue that temp gauge does not work. Replaced the temp sending unit, check good continuity on wire from sending unit to cluster, grounded the wire to the - terminal on battery but gauge still does not read above "0". Flushed coolant and did pressure check, all was good. Any ideas?
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Unread 12-31-2014, 03:11 PM   #10
fishadventure
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1991 YJ Wrangler 
 
Join Date: Jul 2013
Location: Morrisville, VT
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Yes- good chance it's the infamous wonky printed circuit issue. Answers in the faq
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Unread 12-31-2014, 03:50 PM   #11
TippmannA-5
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1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: River Heights, UT
Posts: 126
Mine works kind of. I checked the connection on the back of the head but it did not change. I checked the engine temp were the coolant hose attaches to the head with a infrared thermometer and it said it was at 200 degrees while the gauge read what is pictured.
imag0095.jpg  
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Unread 12-31-2014, 06:32 PM   #12
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 17,610
It's the connection to the gauge. You can jumper power to it to check function.
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