How can I test my temp gauge? -
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post #1 of 5 Old 02-18-2009, 04:17 PM Thread Starter
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1992 XJ Cherokee 
Join Date: Jan 2007
Location: Alamogordo
Posts: 372
How can I test my temp gauge?

My temp gauge has never moved as long as I've owned the vehicle. I do know that my engine has overheated a few times, though. Is there a way to test my gauge at some point down the line to find what is at fault? I don't know where it leads to. I don't even know what parts are replacable in this case.

Where should I start? Any help would be appreciated.


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post #2 of 5 Old 02-18-2009, 04:44 PM
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1995 XJ Cherokee 
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Location: Utah
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all parts are replace able.

The gauge can be replaced.

The most common problem is the sending unit. I have tried to get a Temp-to-resistance table for the gauge but have never gotten much.

The sending unit is located on the right side of the valve cover on the block close to the fire wall. There is a single wire connector comming out... thats it. its a few bucks to replace.

you could get a low resistance potentiometer and adjust the resistance so it acts like the sending unit and see if the gauge changes.

Or if you already have the sending unit get a cup of hot water (or cold if the motor is hot) and pull the connector connect it to the new sender unit and put it in the water in the cup. you will have to ground the sending unit. but if it changes then you know the gauge is working if not then its the gauge...

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post #3 of 5 Old 02-18-2009, 04:55 PM
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When I replaced my gauge cluster I thought my temp gauge was broken but found out it was only stuck. What you have to do is unhook the wire from the sensor (drivers side rear of head) then using a small piece wire ground it out and turn your key on. This should cause you temp gauge to move. If it doesnt then you gauge is broke, it if does then you need a new sensor.

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post #4 of 5 Old 02-18-2009, 04:56 PM
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Worse comes to worse, get an aftermarket gauge.

2014 Jeep Grand Cherokee Summit
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post #5 of 5 Old 02-18-2009, 10:03 PM Thread Starter
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So, is the wire going into the valve cover just a cheap thermocouple? That would be an easy fix.

Okay, thanks guys. I'll get a chance to take a look at it this weekend.

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