Temp Gauge not working. - JeepForum.com
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post #1 of 20 Old 09-15-2009, 02:54 PM Thread Starter
BigLou
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Temp Gauge not working.

I'm new on here and looking for some help.

My temp gauge is not working so I did some research on here and it seems a common problem is the sending unit. I replaced that and still not working. Moves about a millimeter on start up. I checked and cleaned the ribbon and its all nice and clean. Checked it with a volt meter and its getting power. Should I replace the sensor that's in the thermostat?

Thanks for the help

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post #2 of 20 Old 09-15-2009, 03:02 PM
Mean Max
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Here is where your temp gauge sending unit is. Pull the wire off & ground it while the key is on, the gauge should peg out to "hot" if the wiring is okay. If it works, then you need a sending unit.


The sensor in the T-stat housing only supplies a signal to the ECM, not the gauge.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #3 of 20 Old 09-15-2009, 03:12 PM Thread Starter
BigLou
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Well I just replaced the sending unit. I tried grounding the wire and the gauge doesnt move. any ideas??
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post #4 of 20 Old 09-15-2009, 03:16 PM
Mean Max
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Quote:
Originally Posted by BigLou View Post
Well I just replaced the sending unit.
The one in the rear of the cylinder head, like in the pic I posted?

I tried grounding the wire and the gauge doesnt move.
With the key in the "on" position, right?

any ideas??
That leaves the wiring, the ribbon, and the gauge as culprits. Time to start checking circuits, do you have an electrical schematic?
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Max has a picture of every Jeep part ever made.
Quote:
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #5 of 20 Old 09-15-2009, 03:23 PM Thread Starter
BigLou
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The one in the rear of the cylinder head

Key was in the "on" position

And If the Chilton's manual has one they I have one.
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post #6 of 20 Old 09-15-2009, 03:29 PM
Mean Max
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PM sent.

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Quote:
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #7 of 20 Old 10-19-2010, 09:55 AM
jacobAnstett
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whats the ribbon?
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post #8 of 20 Old 10-19-2010, 10:16 AM
Roadyy
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whats the ribbon?
On the back of the gauge cluster is a circuitry ribbon that runs the power to each gauge.
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post #9 of 20 Old 10-23-2010, 06:26 PM
94Wrangler4L
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that the same for 4.0?
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post #10 of 20 Old 10-23-2010, 08:44 PM
Mark05059
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Quote:
Originally Posted by 94Wrangler4L View Post
that the same for 4.0?
the ribbon is behind the dash inside the jeep... engine size doesnt matter at all.

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post #11 of 20 Old 10-23-2010, 09:43 PM
Billy
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Quote:
Originally Posted by Mean Max View Post
Here is where your temp gauge sending unit is. Pull the wire off & ground it while the key is on, the gauge should peg out to "hot" if the wiring is okay. If it works, then you need a sending unit.


The sensor in the T-stat housing only supplies a signal to the ECM, not the gauge.

Max


i was having the same problem.
the hell sending unit did i replace? lol.

"Life ain't all burritos and strippers, my friend."
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post #12 of 20 Old 10-23-2010, 09:57 PM
guy.griffin
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I changed mine because it wasn't working put new sensor in gauge pegged hot, so I thought I got the wrong sensor changed it out again next one didn't do anything so I don't know if I have a bad gauge or wire some where
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post #13 of 20 Old 09-04-2013, 02:36 PM
ManWithTheVan
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I'm having a problem with this I replaced the sensor on the rear of the block and my guage still doesn't work I've grounded out the wire tht goes to it and it did peg to hot any ideas ? Could the parts store sold me a bad sensor?

87 wagoneer 4.0
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post #14 of 20 Old 09-04-2013, 07:18 PM
Old4X
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You can test the sensor with a multimeter and thermometer .

4.0 COOLANT TEMPERATURE SENSOR: Temperature-to-Resistance Values (Approximate)

212 farenheit 185 ohms
160 farenheit 450 ohms
100 farenheit 1600 ohms
70 farenheit 3400 ohms
40 farenheit 7500 ohms
20 farenheit 13,500 ohms
0 farenheit 25,000 ohms


Early sensors measure about 80 ohms cold to 9 ohms hot. Not sure when the change was made, but resistance on all temp sending units drops as it gets hotter.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #15 of 20 Old 09-05-2013, 06:48 AM
ReDinTX
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I had similar problem and the actual solider on the back of the gauge had cracked and so there was an open connection in the circuit. I did a poorman fix because i didnt have my solider iron and has been workin like a champ

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'90 Yj 4.2L 5spd
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