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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 07-06-2012, 10:16 AM   #1
rangerkid2187
 
Join Date: Jul 2012
Vehicle: 1986 Mustang GT
Location: IL
Posts: 3
Default 86 Mustang Temp Gauge Not Working

Hey all,

New to this forum. I have an 86 GT that is mostly stock with 47k original miles on it. The temp gauge recently went out on it and I have replaced the temperature sending unit with a new motorcraft sending unit. Turned the car on and let run for a few minutes with no movement in the gauge. All the other gauges work just fine.

Help? I just bought a voltmeter as well, but I am not too well versed in the electronics of the car. Also somewhat of a newb mechanically speaking, but learning as we go!

thanks!
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Old 07-06-2012, 10:30 AM   #2
dawson1112
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Youll need to make sure the wire running from the sending unit to the gauge is not broken someplace. Inspect the wire as far as you can in the engine bay and as far back as you can. Make sure the connector is not all corroded or broken. Im thinkink that wire runs right up into the cluster to that gauge. After you verify the wire is good i guess change the gauge. .......You could just try to put a good gauge in there but if the wire is broke youll be back to tracking it down.
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Old 07-06-2012, 10:32 AM   #3
dawson1112
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Quote:
Originally Posted by dawson1112 View Post
Youll need to make sure the wire running from the sending unit to the gauge is not broken someplace. Inspect the wire as far as you can in the engine bay and as far back as you can. Make sure the connector is not all corroded or broken. Im thinkink that wire runs right up into the cluster to that gauge. After you verify the wire is good i guess change the gauge. .......You could just try to put a good gauge in there but if the wire is broke youll be back to tracking it down.
Oh you could just get an aftermarket temp gauge and run a new wire from the sending unit to it
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Old 07-06-2012, 11:39 AM   #4
mattdel
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Ground the wire leading to the sensor. If the wiring is OK and the gauge works properly, the gauge will pin out @ hot.
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Old 07-06-2012, 05:50 PM   #5
rangerkid2187
 
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Vehicle: 1986 Mustang GT
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Talking

cool, will try looking at tomorrow morning. Its horrible to try to do anything when its 100 degrees in the midwest. Need to do before 9am when its only 85 out.
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Old 09-03-2012, 02:01 PM   #6
rangerkid2187
 
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Turns out the temp sending unit was bad and drove it around some more and its working fine now. Seems to sit on the hot side though when driving, but will flux some based on driving, not sure what that is all about, maybe need to upgrade the thermostat or radiator to get it to run cooler.
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Old 09-03-2012, 02:01 PM
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