Temperature gauge sending unit - JeepForum.com

 
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post #1 of 14 Old 08-12-2013, 06:19 PM Thread Starter
CBinDC
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Temperature gauge sending unit

Does anyone know where the sensor that drives your temp gauge is located? I have '89 4.2L.

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post #2 of 14 Old 08-12-2013, 06:52 PM Thread Starter
CBinDC
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Can anyone help me? My temp gauge is reading in the red after only driving for a few minutes. The radiator is full and so is the reservoir. I think my sensor has gone but I don't know where it is. My gauge is a one year old autometer and has worked accurately until recently. My guess is the sensor.
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post #3 of 14 Old 08-12-2013, 07:06 PM
rocketboy
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Back of the intake manifold behind the carburetor. Just right of the valve cover. Has a single lead on top.

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post #4 of 14 Old 08-12-2013, 07:54 PM
Old4X
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It is on the cylinder head itself, driver side near firewall.

There are 2 sensors on the intake, they are for the computer: knock sensor and temp sensor (does not drive gauge, for computer only)_

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #5 of 14 Old 08-12-2013, 07:59 PM
Que89YJ
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Ground the sensor wire to the block and the guage should go to 0. If it does then your sensor is bad. If it doesn't then you have a wiring issue.

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post #6 of 14 Old 08-13-2013, 02:15 PM Thread Starter
CBinDC
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Quote:
Originally Posted by Que89YJ
Ground the sensor wire to the block and the voyage should go to 0. If it does then your sensor is bad. If it doesn't then you have a wiring issue.
How do you do this without screwing up the fitting on the end of the wire? It's a cap that fits over the threaded part of the sensor.
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post #7 of 14 Old 08-13-2013, 02:31 PM
Old4X
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Use a #8 machine screw, 1 inch or longer

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #8 of 14 Old 08-13-2013, 02:44 PM Thread Starter
CBinDC
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Thanks for the info but I was referring to how to ground the wire without screwing up the fitting.
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post #9 of 14 Old 08-13-2013, 02:45 PM Thread Starter
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I'm trying to determine of the wiring is bad or the sensor.
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post #10 of 14 Old 08-13-2013, 03:22 PM
XJ93
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Put the screw in the open end of wire, touch screw head to engine block. It won't screw up the terminal.
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post #11 of 14 Old 08-13-2013, 03:27 PM Thread Starter
CBinDC
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Great idea. Thanks.
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post #12 of 14 Old 08-13-2013, 03:44 PM
XJ93
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Thank Old4X, it was his idea.
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post #13 of 14 Old 08-13-2013, 03:51 PM Thread Starter
CBinDC
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I didn't get that at all. Haha I can be a little slow sometimes. Thanks for your patience.
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post #14 of 14 Old 08-13-2013, 04:29 PM
XJ93
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No prob
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