Coolant Milky White, Oil is not

01Stang65

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Jan 19, 2017
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So I just swapped a new 4.6 2v motor into my 01 GT, and filled up with new coolant obviously. After less than 20 drives, the coolant looks super milky white, not even a hint of green. The car is blowing off alot of steam/clouds from the engine area and I can't tell where it is coming from. I think its coming from the headers.

Previously when installing the motor I removed the valve covers to paint them and reinstalled. I messed up the gasket a couple times and finally got it right the 3rd time. So I initially thought the steam was the dripping oil burning off the headers, but again that was 15 drives ago, shouldn't that have cleared up by now?

The oil seems to be clean. The coolant is not. Whats going on here?
 
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7991LXnSHO

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How is the gasket on the oil filter adaptor?
The o ring like thing was the issue when I had oil on my coolant.
 

01Stang65

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How is the gasket on the oil filter adaptor?
The o ring like thing was the issue when I had oil on my coolant.
When I got the new motor I replaced all the external gaskets, even though it only has 30k miles on it. I know for a fact I did that one right.

Strange... When I first got engine swapped and took it out for a drive, the coolant res was just slightly low because that's all I had on hand. I only drove it a few times like that, today I check it and it's super milky. After the engine cooled down and the coolant settled, the res was completely empty. A friend told me to fill it up, run the car and see if it bubbles, it didn't.
 

01Stang65

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I would check or replace your oil cooler gaskets to see if they have failed. I think that is what 7991LXnSHO is referring too. Good luck
So a couple things I noticed after driving it for a few days...

-I think previous coolant levels were so low, that whatever residue was in the engine from sitting before it went in my car just got mixed with the low amount of coolant and turned it milky white.
-I filled the coolant the rest of the way and sure enough returned it to it's green color. After driving it for a few days it has stayed green and not lost it's level.

Alot of times it's the easy stupid mistakes, glad I tested more before just assuming a gasket leak.
 

TIGGER

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So no more steam from the engine? I would still drain and flush the cooling system just to make sure there is clean coolant in the motor. I would not want to run that muck thru my cooling system for very long.
 
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01Stang65

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Jan 19, 2017
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So no more steam from the engine? I would still drain and flush the cooling system just to make sure there is clean coolant in the motor. I would not want to run that muck thru my cooling system for very long.
I'm going to drain it tomorrow... The steam was valve cover gasket and I fixed that. All troubleshooting things with this new engine. I'm sure there will be more hiccups the more I drive the car.