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Unread 08-12-2013, 08:42 AM   #1
Tyler980
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temp gauge

My 88 yj temp gauge used to work... now it doesn't. Any ideas what I could do to get it back?

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Unread 08-12-2013, 11:52 AM   #2
Randonexplosion
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Check the connection at the coolant temp sensor. If that is ok, replace the sensor and/or trace the wiring back as far as possible and look for breaks. It should be a single wire.
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Unread 08-12-2013, 12:11 PM   #3
Tyler980
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Its the one that sits closer to firewall behind the carb correct?
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Unread 08-12-2013, 12:21 PM   #4
Randonexplosion
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Yep, right next to the valve cover.
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Unread 08-13-2013, 10:38 AM   #5
Tyler980
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It looks okay
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Unread 08-13-2013, 10:44 AM   #6
Que89YJ
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With the wire disconnected from the sensor it should be max hot. Disconnect the wire and ground it to the block and it should go max cold. If it does those then the sensor is bad. If it doesn't then the wire or guage is bad.
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Unread 08-13-2013, 10:57 AM   #7
Tyler980
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Okay thank you. I will try that when I get home.
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Unread 08-13-2013, 11:47 AM   #8
Tyler980
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Pulled it off and no change.
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Unread 08-13-2013, 02:35 PM   #9
XJ93
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Pulled it off, did you ground it? Stick a machine screw in the end of it and touch the screw head to the block and look at the gauge.
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Unread 08-13-2013, 04:42 PM   #10
Tyler980
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Ah I didn't I will try that thank you
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Unread 08-14-2013, 07:40 PM   #11
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Quote:
Originally Posted by Que89YJ View Post
With the wire disconnected from the sensor it should be max hot. Disconnect the wire and ground it to the block and it should go max cold. If it does those then the sensor is bad. If it doesn't then the wire or guage is bad.
Backwards.

Pull wire off = full cold

Ground wire = full hot

The temp sensor is a "TURD" sensor.

Temperature Up Resistance Down

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Unread 08-14-2013, 07:47 PM   #12
Tyler980
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I pulled the wire off and used a machine screw and grounded it and the gauge still did nothing.
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Unread 08-14-2013, 08:07 PM   #13
Randonexplosion
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Then I'd say you have an interruption in the wire or a bad gauge. Happy hunting

Maybe you can try to pull the gauge and see of there is any corrosion on it.
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Unread 08-14-2013, 08:18 PM   #14
Tyler980
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I'm not really sure how to pull the gauge out.
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Unread 08-14-2013, 08:23 PM   #15
Randonexplosion
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There are a few upper and lower screws on the panel that covers the gauge. After that just a few more screws and it should come out.
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