temp gauge - JeepForum.com
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post #1 of 26 Old 08-12-2013, 08:42 AM Thread Starter
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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post #2 of 26 Old 08-12-2013, 11:52 AM
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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post #3 of 26 Old 08-12-2013, 12:11 PM Thread Starter
Tyler980
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Its the one that sits closer to firewall behind the carb correct?
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post #4 of 26 Old 08-12-2013, 12:21 PM
Randonexplosion
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Yep, right next to the valve cover.
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post #5 of 26 Old 08-13-2013, 10:38 AM Thread Starter
Tyler980
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It looks okay
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post #6 of 26 Old 08-13-2013, 10:44 AM
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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post #7 of 26 Old 08-13-2013, 10:57 AM Thread Starter
Tyler980
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Okay thank you. I will try that when I get home.
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post #8 of 26 Old 08-13-2013, 11:47 AM Thread Starter
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Pulled it off and no change.
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post #9 of 26 Old 08-13-2013, 02:35 PM
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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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post #10 of 26 Old 08-13-2013, 04:42 PM Thread Starter
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Ah I didn't I will try that thank you
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post #11 of 26 Old 08-14-2013, 07:40 PM
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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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post #12 of 26 Old 08-14-2013, 07:47 PM Thread Starter
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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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post #13 of 26 Old 08-14-2013, 08:07 PM
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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post #14 of 26 Old 08-14-2013, 08:18 PM Thread Starter
Tyler980
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I'm not really sure how to pull the gauge out.
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post #15 of 26 Old 08-14-2013, 08:23 PM
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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