Engine coolant temperature sensor location - JeepForum.com
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post #1 of 6 Old 04-17-2012, 02:31 PM Thread Starter
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1979 CJ7 
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Engine coolant temperature sensor location

I'm a newbie to the forum and to jeep ownership. I have a 1979 CJ7, with a 258 cubic inch inline 6 engine. I purchased this as a restoration project.

It appears that someone removed/cut every wire from the gauges except the oil pressure gauge. I want to get all of the gauges working eventually. I'm concentrating on the temperature and fuel gauges. I have seen several really good trouble shooting forums on here. However, I have a very simple question. Where is the engine coolant temperature sensor located on the engine. I see something that appears to be installed in the head, under the left side of the carb as you look at the engine from the front of the jeep. It appears to be a copper tube that someone cut with diagonal cutters. Could this be what I am looking for. Nothing on the engine other than the oil pressure unit has any wires attached.


1979 CJ 7, 258 cubic inch restoration project.
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post #2 of 6 Old 04-17-2012, 02:48 PM
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If my memory serves me correct, when I had a 258 IL6, it was next to the firewall.

As you are sitting in the jeep, it is on the left side of the engine, at the back. You will see a 3/8 or 7/16 thread brass fitting sticking up out of the head with 1/8 inch bolt threads on it. Thats where the coolant temp sensor wire goes. I think the wire is purple.
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post #3 of 6 Old 04-17-2012, 02:55 PM
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On my 77 258 it is in the exact location as above.

Top of head next to valve cover. Next to firewall driver side.
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post #4 of 6 Old 04-18-2012, 07:47 AM Thread Starter
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I found it right where you said. It is covered in dried mud and oil...and with no wire. That made it hard to recognize. I will order a new one and add a wire to the gauge. And keep my fingers crossed that will fix it. If not on to more trouble shooting.


1979 CJ 7, 258 cubic inch restoration project.
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post #5 of 6 Old 01-21-2013, 09:16 PM
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I know this is an old thread, but I just stumbled upon it... just a little FYI in case you havent figured it out yet, the fuel gauge, water temp gauge, and ammeter will ALL stop working IF the CVR is bad. BJ's Offroad sells a replacement gauge w/ the CVR for under $30 and it will usually fix this problem...
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post #6 of 6 Old 01-21-2013, 09:26 PM
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stork84dubya, is that your real name?

Welcome to the Forum, if you fill out your Profile it would be an asset.

CVR - XXX Voltage Regulator?

There is a voltage regulator in the fuel gauge, see John Strenk's excellent write ups on this. Without it the fuel sender is toasted but as far as I am aware it does not feed the ammeter. I may be wrong, mine has a voltmeter.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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coolant , sensor , temperature

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