Why is my coolant reservoir getting empty - Mustang Evolution

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Old 12-08-2015, 06:48 PM   #1
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Why is my coolant reservoir getting empty

The reservoir gets low on coolant all the time and I always top it off at a cold start. When its warmed up with pressure the reservoir will fill back up sometimes when I take the top off. Just today the reservoir was over flowing Click image for larger version

Name:	ImageUploadedByMustang Evolution1449622073.249795.jpg
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ID:	194561 and started over heating. Why is it doing this? Motor was built about 3 months back and the reservoir constantly gets low


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Old 12-08-2015, 07:47 PM   #2
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Sounds like your coolant is low because it's overflowing, just like you said it was doing. This could be a head gasket leak allowing combustion gases into the cooling system. I'm assuming you didn't build the engine when I say this, but I'd take it back to whoever did.
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Old 12-08-2015, 08:24 PM   #3
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Fan wires melted so this whole time no fan was running


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Old 12-08-2015, 08:44 PM   #4
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Quote:
Originally Posted by phantom_5_liter View Post
Fan wires melted so this whole time no fan was running


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That's fantastic...
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Old 12-08-2015, 10:54 PM   #5
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Yea it sure is.
Has anyone else have that problem? The fan connector melting or burned?


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Old 12-08-2015, 11:43 PM   #6
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No but a picture would be nice. Last winter for some reason my fan/Ac clutch fuse blew and I accidently ran all winter with no fan. Luckily I live in Arctic climates so it never overheated. Only issue was when I went to use my Ac in the spring it didn't work. That's how I found my issue. Maybe the connector on my fan is melting? I'll have a look at it tomorrow.


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Old 12-09-2015, 12:58 PM   #7
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@ phantom_5_liter the engine was running too hot when you took the tach pic. Should always point in middle even if water is 230 degrees. The Coyote cooling system has an unusual thermostat location before the water pump inlet so that might be messed up. Another possibility is the coolant tank pressure cap gone bad. Just hoping not a head gasket issue.

Melting fan wires might be from fan staying on continuously but which happened first - overheating or dead fan. If it still overheated driving at any speed I'd guess fan was not the primary cause.
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Old 12-09-2015, 01:17 PM   #8
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so when it's cold you fill it to top? if so it will overflow when it heats up (expand)

if fan wasn't running you may have more problems....fix fan/fill to min when cold/retest everything
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Old 12-09-2015, 03:20 PM   #9
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dude do you ever look at the temperature gauge? I know this isnt helping, but it could have saved you some headaches........
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