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2012 GC: Coolant thoughts and questions

3.3K views 7 replies 5 participants last post by  vipergg  
#1 ·
Hi all. I have a 2012 GC that I bought off the lot years ago.

This week, it started throwing a P0128, and I confirmed that the coolant temp isn't getting about maybe 160 degrees, so I'll need to change the thermostat, and this will require me to add some extra coolant.

I know it would have come with a factory HOAT fill. However, back in 2016-ish, I got upsold on a radiator flush at the local Mr Lube. At the time, I had no idea that there was a model year break in the coolant used, so I assumed it was refilled with HOAT.

However, now I'm not so sure anymore. The coolant in the overflow jug is very clean and bright orange - like a melted orange popsicle orange. I want to believe that it's a proper HOAT fill, but I would expect that to be yellow if it's coming aftermarket. I read somewhere that aftermarket Dexcool fills are often also Orange, which makes the think the kid who did the flush was as clueless as I at the time, and filled it with Dexcool.

So, my million dollar questions are such:

1. Is there a definitive way I can tell what kind of coolant is in there?
2. Is it common for Dexcool to be orange in an aftermarket fill?

Unfortunately, paperwork that reflects that coolant flush disappeared when I moved a few years back.

I'd rather not pay for a full rad flush right now, but I need a solution, and I'd appreciate any thoughts!
 
#3 ·
Well, it's HOAT or OAT, not IAT (Original Green).

HOAT and OAT tend to be long life coolants, like 5 years.

Dexcool won't be a problem either, it's OAT. Their problems are history and more related to gaskets than the coolant. The new Chrysler OAT coolant is essentially Dexcool.

What you have is likely a Universal type coolant such as Prestone or PEAK. You could do a drain and refill with HOAT. Valvoline say their ZEREX G-05 HOAT is compatible with many coolants commonly available.
 
#4 ·
Interesting thought. PEAK's orange coolant is their Dexcool-compatible OAT, as is Prestone's. As are a few other generics that I looked at are also orange.

I'm starting to think that the refill is definitely Dexcool - the person doing the flush probably saw the orange factory HOAT fill, and refilled with what they knew as orange (generic Dexcool).
 
#5 ·
I think I'm seeing that my future is going to include draining and flushing, then installing OAT.

Is there a major issue with topping up with 'green' coolant, and just planning on a full flush in 6 months when the temperature warms up? I'm creeping up on the interval for a full drain / flush anyways.
 
#6 ·
Go to Home Hardware and check out their Unival antifreeze.