Temp Gauge "Floats" - Mustang Evolution

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Old 10-28-2012, 05:43 PM   #1
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Temp Gauge "Floats"

What would cause my temp gauge to float? One second its at normal temp then just drops a quarter if the way down then goes right back to normal.
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Old 10-28-2012, 06:17 PM   #2
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Either a bad sensor or air in the system.
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Old 10-28-2012, 07:01 PM   #3
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What sensor would it be if that is what it is?

If it is air how would I get that out?
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Old 10-28-2012, 07:06 PM   #4
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there should be a water sensor/sending unit on the intake somewhere in the water passage.

for air you can usually just runn it for a while with the cap off and it should burp out. then you may need to add coolant accordingly.
i would think he air is most likely the problem. whenever an air pocket gets by the sensor it is causing faulty readings.
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Old 10-28-2012, 07:19 PM   #5
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Thanks ill give that try and hope it solves the problem.
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Old 10-28-2012, 07:20 PM   #6
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hopefully ... if not let us know and we will see if we can figure out anything else.
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Old 10-29-2012, 10:19 AM   #7
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Yup, air bubbles or a possible broken sending unit wire are the most likely causes.
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Old 10-29-2012, 08:41 PM   #8
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Quote:
Originally Posted by Trojan Horse View Post
Yup, air bubbles or a possible broken sending unit wire are the most likely causes.
Sounds like air, I had this issue 2 hours ago, with engine cold, open rad cap, and rev engine a few hundred RPMs higher than idle, hold it there till the temp gauge settle. Add coolant/water as needed Good luck
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Old 10-29-2012, 09:21 PM   #9
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Did this twice today and it is better now. Still floats a little but not nearly as much as it did.

Going to do it again tomorrow and see if that takes care of it. Hopefully it does.
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Old 10-29-2012, 09:22 PM   #10
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Did this twice today and it is better now. Still floats a little but not nearly as much as it did.

Going to do it again tomorrow and see if that takes care of it. Hopefully it does.
awsome man. make sure it gets to full rrunning temp for a while.
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Old 10-30-2012, 12:42 AM   #11
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awsome man. make sure it gets to full rrunning temp for a while.
Yeah these 5.0's have a lot of air pockets it seems...
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Old 10-30-2012, 12:48 AM   #12
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I jacked the front if my car up high as i could and it seemed to help getn all the air out

---------- Post added at 12:48 AM ---------- Previous post was at 12:48 AM ----------

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I jacked the front if my car up high as i could and it seemed to help getn all the air out
Let it run like that for awhile with the cap off
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Old 10-30-2012, 01:21 AM   #13
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Originally Posted by Kenny laird
I jacked the front if my car up high as i could and it seemed to help getn all the air out

---------- Post added at 12:48 AM ---------- Previous post was at 12:48 AM ----------



Let it run like that for awhile with the cap off
I'll try jacking it up and see if it helps get that little bit out.

I let it run for 30-45 minutes both times giving it gas every 5-10 minutes. Hopefully there is still a small bubble in there I can get out and not a sensor/sending unit problem.
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