Originally Posted by IMMORTEN View Post
"Traditional" Ethelyne Glycol or IAT Inorganic Acid Technology. The green stuff most people think about when they think about coolant.
OAT-Organic Acid Technology. Dexcool is an example of OAT.
HOAT-Hybraid Organic Acid Technology- The newer (past mid 12/13 model year) JKs and JLs use a OAT coolant, where as pre 13 models used a HOAT coolant, this has caused a lot of confusion for JK owners especially the guys with JKs built late 12 as a 13 model. I call it "Unicorn Blood" because it's blue/purpleish and in certain light conditions can even look a bit like dexcool. It can get confusing.
The move to these new coolant technologies has been done in the name of extended service intervals, hence why many GM cars with dexcool has coolant drain intervals over 100k miles or 10 years IIRC.
Big problem is mixing these types of coolant can have big consequences. Such as total cooling system destruction. I'll post a picture below to show an example.
I don't think that's what's happening here. I think the previous owner ran straight water (I see you found that already) in the system (probably not even distilled) which means you had water with no anti corrosion properties circulating though an Iron block and head. Not a recipe for longevity.
Now you can switch a system over to other types of coolant but it must be flushed VERY WELL. You don't want any of the old coolant hanging around in there if you decide to go that route. Good luck. Glad you caught it early and not when the system consisted of solid clay
As you can tell from the chart below going strictly off of color isn't always a good idea. And this chart is older there are more colors out there now.
1995 Jeep Cherokee Country 4X4 Stock
Originally Posted by klaxmaster View Post
I did a quick visual inspection of the hoses and thermostat, they didnít appear to be affected or compromised by the rusty water, so itís possible that it didnít run this way for very long.
But to be honest, I donít plan on keeping this Jeep for more than a year or two, when my mechanic inspected the underbody of my Jeep, he made a few discoveries that pointed to this Jeep had a hard life in salt water (possibly used to toe a boat and off / on load it in salt water.
The body of the Jeep is fine, but a lot of the underside parts are not in a healthy condition, all of which will be too expensive and not feasible to fix for a Jeep I paid around Ä1200 for.
Originally Posted by downs View Post
That was a very informative and educational post, thank you very much for taking the time to write it out.
That put things in a different perspective for me and opened my mind for things to look out for and consider when I look at coolant.
Again; thank you very much for taking the time to write that out for me. Your post is very well written and formulated in a clear and easy way to understand
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