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Old 07-23-2010, 09:27 AM   #1
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Temp Guage reading to warm

Hey all,
I recently went through this and felt compelled to share.
I have seen many threads about the 95 Wrangler running hot. The previous owner of mine had smoked the head gasket (replaced before I bought it) and now the guage was reading around 230 degrees. I went to a friend who put in on a scope to read the electronic temp sensor, located at the Thermostat housing to compare. Turns out, there was a 30 degree difference between the electronic temperature sending unit (more accurate) and the resistance to ground temp sending unit (for the guage)
The fix:
$15.00 dollar temp sending unit.
Let the motor cool completely down--VERY IMPORTANT!!!!
the sensor is mounted at the rear of the head, drivers side. The wire pulls off, and a simple deep socket was able to remove. Be sure to have the new one ready to go in, as a bit of coolant will shoot up and out. Tighten back down, hook up the wire and now my guage is back to normal.

May not be the fix for everyone, but it is a great place to start.

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Old 07-23-2010, 11:07 AM   #2
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Great bit of info. Thanks.

Jeff

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Old 07-23-2010, 12:27 PM   #3
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Thanks man! I have wanted to check mine too. I am gunna change it out!
And the oil sending unit. ( oil pegged at 80 b 4 start-up ). Thanks.

T
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Old 07-23-2010, 11:15 PM   #4
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Thanks TBell.

That's one of the most requested problem fixes on this forum.
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Old 08-16-2010, 07:24 PM   #5
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I have a 2007 temp gauge stays at normal stright up when cold then goes to hot after driving but its not hot . Gauge never comes down at all ? Any help
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Old 08-17-2010, 07:12 AM   #6
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Boat567b,
I am not as familiar with the newer models, and if they have changed anything.
My guess would be the guage itself, but that guess is predicated on your's being a similar system as mine.
Maybe some of the owners of newer models could chime in?
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Old 10-11-2010, 09:17 PM   #7
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i recently had my jeep serviced at Big O for some broken bolts at the thermostat, they replaced the bolts. milled the head. replaced the thermostat housing with a new one and installed a new thermostat. now she's reading at about 230ºish. i'm going to try this because the techs at the shop said the temp was right, the guage was off.

does anyone have a part number for this sending unit?

thanks!
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Old 03-24-2013, 08:34 PM   #8
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temp gauge issue

I also recently went through the same issue. My temp gauge wasnt reading at all. I replaced the sending unit and it was just pegging out at over 260. I ended up switching out the sending unit for another (different brand) and now it reads one hash over 210. The weird thing is that if I just leave the engine running parked on the drive way the temp will climb up to about 260, the engine still runs smooth, the top radiator hose stays cold, I'll drive it once around the block and its like the thermostat finally opens and the gauge shows about 210 while driving. I,ll get out and feel the top radiator hose and its warm to the touch. If I stop too long while driving the temp will climb up again to the red zone. I've replaced the radiator, therm, sending unit, burped the system and ensured that there are no leaks and that the coolant is topped off. I really want to fix this issue so i dont have any worries when on the trail. The only thing that i havent messed with is the water pump. Could that be an issue?

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