Oil Cooler Reseal. Oil change Coolant flush

[CaptainMorgan556]

Alright gentlemen, the coolant in my Degas bottle is very dark, either brown or black. I believe there is oil in my coolant. But there isn't any coolant in my oil which should mean my headgaskets are okay but it points to my oil cooler. Here are my questions.
1) How hard is it to remove? And what do I have to remove first out of the way to get to it?
2) Do I have to drain my oil as well as coolant?
3) Since I think there oil I'll need to get it out, can I run the truck with simple green or some sort in the coolant for a little to clean it out? Or should the truck be off and I spray a hose through it or something.
My truck is Stock height on 33 inch tires and is 4 wheel drive, if any of that helps.

 

[79jasper]

From my experience 4x4 makes it easier. Mine was a breeze.
I didn't have to take anything extra off.
It's good to replace the block drains with a petcock. Or at least pull them to get the most of the coolant out. Won't get as bad of a shower that way.
Plan on draining both. When you pull it off some coolant will get into the oil, vise versus.
I would try flushing with just water first.

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[CaptainMorgan556]

I bought the full kit from Dieselorings.com , should I take the both sides that the cylinder slides into out? Or can I get away with jusy leaving the one in towards the front of the engine and remove the cylinder and oil filter piece?

 

[79jasper]

Do both. Best to replace both gaskets anyways.

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[Clb]

Hit the tech sticky! Its a good primer!

 

[Ruger_556]

Do both. Best to replace both gaskets anyways.

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Yup, what he says. Plus if I remember correctly the ends don't just push right back on easily... I wouldn't want to try and shove it together in the engine bay.